Do you think i might be lesbian/bi?

i'm 14, and sometimes i fantasise about making out with my best friend... i've kissed 2 girls before (made out) but one was when i was really little, and the other was when me and my friend both had boyfriends and didn't know how to kiss, so we pretended each other was our boyfriends and learnt...!! but i also like guys and can't wait to get a boyfriend? do you think i could be lesbian? i don't want to be... :( but if i am, i guess i cant do anything. or do you think just because i have been single for a year, and go to a girls only school that my mind is just bored..?? and last night, we were mucking around in the dark.. and we almost kissed... on the lips...!!!!!!!!! and i just wanted more!! :/ if a girl who i found attractive kissed me, i would kiss back..... but same with a guy..... and i don't want to be bisexual!!!!!! ehhhhhhhhh!! help