Well I used to be the popular guy with lots of friends and girls likeing me,but now everybody seems to not care about me and hate me or something,the guys that were my friends don't talk to me anymore and girls talk trash about me
I don't know what to do and it feels like my life is coming to an end
PLEASE HELP!!

Well what did you do?. I would suggest talking to your (ex?) friends and ask what's up.

Maybe your being a back stabber to your friends or your friends are back stabbing you
That's sounds like it( I might be wrong... )
Your life is not over is :)
Make new friends

Don't let it bother you. If people are treating you badly it's for a desired effect; taking away that effect eliminates the need for the behavior. Just try to be sociable. Be mature. The higher you hold yourself the higher other people will hold you.