Im scared of.......is it okay or offensive? ;)?

Kk i dont mind gays but not to kiss and do wrong stuff. But i find lesbians scary idk why i just find it weird being a girl and hearing about lesbians. Im normal i have a crush on a boy, but why are people homosexual? Its kinda gross well not gross discustingly eww..! So is this normal or offensive? What are your views on what i think? I prefer gays i dont mind em.. ;) thx and im 13 if that helps