I've been plagued with this problem for years. Still suffer from it. Everyone sees me as a friend and never considers me as any more. I have two answers: throw yourself into your work (school or job) and, well, develop a substance abuse problem. Caffeine has helped me through the worst times of my life.
Hobbies help too.
I believe that whatever doesn't kill you simply...makes you...stranger.
47th Member of the Keira Knightley Posse