Why are all bi/les girls “tomboy”?

I know that’s a blanket statement but it really sucks growing up as a feminine girl who is bisexual because nobody takes me seriously about my sexuality. Girls won’t give me a chance, even girls who say that they are bi/les and the straight girls always said I just want attention from guys, that’s why I kiss girls at parties and stuff. But I actually just want a full experience with a girl and sometimes I feel like the girls who kiss me at parties in front of everyone are the ones who are actually trying to get attention from guys because if I try to do something alone with them they aren’t flirty at all or they don’t want to go with me and they only date guys. But then they say I’m a whore and I just want attention from guys because I’ve already been with guys before. Actually I think I like girls more than guys but everyone calls me a liar because I don’t act like I’m gay and I don’t dress like a lesbian. Sorry if I’m confusing.

I just want to add that I am a freshman in high school and I don’t mean full sex just kissing and stuff but I don’t want it to just be at parties in front of everyone. I just want a girl to kiss me when we are by ourselves too so I knew it was a real experience and not just them playing games.