Gender identity crisis

Well I’m not out to my family but I identify as a gender fluid bisexual:),but only in the internet because I think of I ever come out to my family I will be said that I’m to young to know that, also they are catholic so that is worst I don’t want them to send me somewhere because I’m gay,btw I don’t know their opinion on lgbtq+a people.Well only my siblings but they have trouble with non binary and gender fluid people.They will also question me why and I don’t know what to say because I still want to stay as a girl but being a boy and looking pretty and wanting a flat chest is very tempting but also not being anything and just being me is nice.My parents and I also don’t have the best relationship sooo idk what to do,but I hope that I spent this pride happy :)