Fuck MySpace. When I'm outta high school, it's all about Adult Friend Finder.
I don't believe there is such a thing as "BI" for a guy. If you suck another guys dick and let him fuck you up the ass you are a Homosexual, period.
Also, why do you need to wait until you Graduate until you get on Adult Friend Finder? Just lie about your age... the men won't care they like them young.