How do I find happiness? I am 20 years old... I used to live a life where I used to be surrounded by good friends and a happy family but the past year there true colours have shown and they haven't been in contact with me in the new year at all. My girlfriend is nice but a lot of the times she puts me down... I get home and my parents are always shouting at me making me feel like the looser that I am and making me feel like being alive isn't a good idea my friends and sometimes my girlfriend also make me feel like this... I previously had suicidal thoughts and they are coming up again... and I have tried committing suicide in the past. I really don't know what to do. In a quick summary:
I have no friends at all (except for one who is so arrogant that he puts me down constantly for what it seems pleasure)
My family just make me feel like I don't want to be alive
My girlfriends will make me feel down or lower myself esteem and won't sound too interested in my feelings but she can make me happy
My job is dead end and I'm never given the opportunity to prove myself...

Someone please help... they say you shouldn't run away from your problems but I really don't know what to do anymore

First off, the problem isn't everyone else... like you are trying to lay it all on... but yourself.

Face that first then you can take steps to improve.

Find out what you are doing now... or not doing that is causing this.. and make changes in your life to correct them. You conform to the world, the world doesn't conform to you.

Yes it sounds like YOU are or YOU have the problem, all of a sudden your parents and friends all have changed ? Sorry,

I would suggest that you get counseling to see if you can discover the real problems