sociopath addicted to WoW game

Hey there. I'm a 16and a half year'old male, and i am severely (AND I MEAN SEVERELY) addicted to a video game, World of Warcraft to be precise. When i say severely, i mean i sometimes play it for 15h straight, with an average play time of 70+h/week. Now, this is the problem. Last year, i joined college. I have made quite a lot of "friends", but , since I was already addicted by then, I didn't really get to know them better than "Hi, how's it going?".That goes even for my class mates. I would really like to drop this f*****g addiction of mine, but when I am really set on doing so, i think that i don't know anyone in my college 2good, and it would feel awkward for me to "interfere" in their friends group. Had a 3month summer holyday, and guess how i've spent it ALL! Yea, you guessed right, sitting in front of the PC , playing WoW or reading WoW forums. It even went to the point where some girls in my class asked me to go clubbing w/ them, but I declined making up excuses, when all I did was play that f*****g game. But that's partly because my self-esteem is inexistent, as in, i see myself as the uglyest, most stupid guy alive. I sometimes have to lie about what i do, because everyone would see that im the biggest geek arround, and it goes to the point when, f.ex, some classmate of mine talks about WoW , i "bully" him, making fun of him for playing that game.

When I started playing this game, 2 years ago, i was 180cm and 75 kg. Now, i am 187 cm and 105 kg, and its only part muscle, mainly fat. PLEASE help me, i really want to get my old life back :-(

P.S.: I should mention that my classmates are pretty rebelious, and i would say the same thing about me.
P.P.S: i work out 4 times/week and swim 3times/week, 1.5hours every tim.