Help dont know what to do?

hi im pretty sure my friends lez or bi and i really like her =] but im nnot gay im straight only gay towards her. ive liked her for about a yr now.im 14 to. the thing is wen were together its always to do with sport so theres aalways people around. and she touches me and stuff like that and shows alot of affection but i seem to push her away coz i dont want others to think im lez. i really like her and want to touch her back and things like that but im scared others will think im lez. wat do i do?