How Does One Tell Another One They Are Not Exactly Heterosexual?

Title says all, I'm fairly certain I'm not straight, I've had the hots for guys in the past, but recently I've felt an attraction to girls, or maybe I've just never considered them as romantic partners? I dunno, but there's this girl, and she's what you'd call a "crush." All those mushy symptoms that come along with that junk. I would make out with her if I could.

So, how do I tell my parents? My friends? I really don't know how to bring that kinda stuff up. I want people to know, I'm tired of people assuming I'm dating all my guy friends when I'm really not even feeling all that interested, at all (even though we're in middle school and "dating" is more like holding hands). I'm proud of my orientation, whatever it is, lesbian, bisexual... So help please? Thanks a bunch in advance c: