For some reason at school, I somehow love it and like the people within the school even though most of the time my so called 'friends' at school seem to treat me like sh*t and mock me for the dumbest reasons claiming they're just jokes- To me I feel they're going a bit too far.

But at home, I'm a much more dark and cynical person- I do whatever I can to avoid everyone I know, I just lock myself in my room on my computer- At home I claim school is the worst thing ever and I despise almost everyone I know from school and possibly in general.

I'm also much more angry at home, and I'm not sure why my personality switches between the two, what's wrong with me?

Tell us more about how you are treated at school?
I'm guessing that you don't like it as much as you try to believe you do, and then let your feelings out at home.
It is very, very tough being a teen, especially with teasing being more mean these days than the past. It's an art to let it roll off your back and even dish out clever responses. It seems to help to have older siblings, or any siblings, or even just more contact with other kids when younger. Are you an only child?

No, I have a younger brother who I seem to treat like sh*t basically. I mean even today, my 'friends' were teasing me, and saying I was crying when truthfully I wasn't. In fact to personally I have a problem with friends, I've had many online friends all of whom left me because I came across to them as an attention-whore (Yes, I also crave attention and even I myself hate it) and I kept lying to them for no reason.

I also lie a lot for even the dumbest things when it isn't necessary.

Sounds like you are covering up a lot of hurt, unloved feelings.
We do that, many of us... we get tough and sarcastic, or self-centered, or needy and clingy..
There are many ways to hide deep hurts.
You may not even know what's under all this! Any ideas?

Sounds like you are covering up a lot of hurt, unloved feelings.
We do that, many of us... we get tough and sarcastic, or self-centered, or needy and clingy..
There are many ways to hide deep hurts.
You may not even know what's under all this! Any ideas?

Well throughout my life, when I've been online- I've had friends however like I said I kept lying and saying I'm an 'attention whore' which I have been craving for attention.

But I'm not sure really.

I got that, but wonder if you can identify when it started, because I think there is something behind it - feelings of being put down, not good enough, hurt, something.
People lie to make themselves look better than they are (or think they are, since you might be perfectly likable but are really scared you aren't). In other words, you may brag and demand attention and lie because you deep down think you are a total loser. WHY? Not to get too psych-y, but did you resent your brother being the new one to get attention? How many years apart are you? Some people say 3 years apart is hell for the older one, I don't know. Do both parents work? Did you get taken care of by lots of babysitters? Any ideas when this all started.

I got that, but wonder if you can identify when it started, because I think there is something behind it - feelings of being put down, not good enough, hurt, something.
People lie to make themselves look better than they are (or think they are, since you might be perfectly likable but are really scared you aren't). In other words, you may brag and demand attention and lie because you deep down think you are a total loser. WHY? Not to get too psych-y, but did you resent your brother being the new one to get attention? How many years apart are you? Some people say 3 years apart is hell for the older one, I don't know. Do both parents work? Did you get taken care of by lots of babysitters? Any ideas when this all started.

Yeah both my parents work, my brother is 5 years apart from me (I'm 15, he's 10) and I do remember getting taken care a lot by babysitters (mainly my mothers relatives or friends I think)

If you think you can find the time of your life when you felt abandoned and unloved, then talk it out with someone (or here). If not, ask yourself if you can make it a project to stop lying and craving attention, like an exam or going on a diet. You write down how you did each day in a journal. List every little lie. Try to force yourself to not lie (even though we all lie A LITTLE, so don't try to be perfect).
Concentrate on being plain old nice to people, even your brother. Nice dress, like your hair, good job speaking in that class, that was really funny, you look really good today. It is amazing how a few words can totally turn someone around in the likability department.
And if you tend to be a drama queen along with attention whore, put a lid on it! TRY. It's a job. You get a million dollars at the end, a PhD, and a Nobel Prize. Answer back about what happens.

If you think you can find the time of your life when you felt abandoned and unloved, then talk it out with someone (or here). If not, ask yourself if you can make it a project to stop lying and craving attention, like an exam or going on a diet. You write down how you did each day in a journal. List every little lie. Try to force yourself to not lie (even though we all lie A LITTLE, so don't try to be perfect).
Concentrate on being plain old nice to people, even your brother. Nice dress, like your hair, good job speaking in that class, that was really funny, you look really good today. It is amazing how a few words can totally turn someone around in the likability department.
And if you tend to be a drama queen along with attention whore, put a lid on it! TRY. It's a job. You get a million dollars at the end, a PhD, and a Nobel Prize. Answer back about what happens.

I'll try, it really won't be easy because I seem to hate a lot of people at school, but I'll try. Thank you.

When nobody is doing good things for you then do them for yourself. Find your own interests and things you enjoy and you will find people who are attracted to you for the fun interesting person that you are. You don't have to hate the people who tease you and try to bring you down, pity them for there stupidity, ignore them, and find cool people to interact with, and fit in better with.

I know the feeling of being young and not fitting in and that make you angry frustrated and filled with hate when you don't. You just picked the wrong crowd, so look around for the right people.

You may be surprised at the ones who are cool, but you never noticed them before, but they are there.

If you don't like your school why don't you move or tell a close relative that you trust and are more comfortable with... and if there teasing you should stand up for yourself.
I know I know it maybe hard but a girl in my year group had the same problem as you then she started standing up and ignoring them. Then she started making friends by stopping her habits like not talking too much or craving attentions.