publically being insulted and now lonely.everybody hates me :'(

i use to be a very jolly person and was very good at making friends.i still am,but the problem is that people find me attractive in the beginning then they lose interest in me.i had 3 close friends but i always use to feel that 1 of them is trying to take my other friends away.this may be wrong but this is wat i feel about her.also she copies me a lot,my dressing sense,my hairstyle,my way of interacting with people and even my ideas.being a close friend used to ask me about my plans and use to tell them as hers infront of all and use to take all the appriciation.i always use to feel bad and started to avoid them.but still she didn\'t stop copying me and took my frustration to another level.it made me so blind that i started thinking of taking revenge and did something really wrong to her.i exposed her phone number to unknown people and told them to call after ten everyday and talk dirty. she caught me and told my entire friend circle about what i did and also put it on facebook.evry1 abused me.they called me and abused me infront of entire collage.even though i apologized.i said sorry to her on a message first,when only few of them knew.but still she did it. i even apologized to her during and after the fight.m so depressed, can't sleep,don't feel like eating coz i don't hav even a single friend to talk to.i feel lonely and most of the time keep crying.m also very scared about what action she'll take regarding my act as she said,"this is not the end, i'v already taken it to a higher level that u can't even imagine"..i'm really tensed and locked up in a room.i don't have guts to face them.what should i do???please help me...