Coming out

I am a 14 year old bisexual girl. I've known my whole life that I was bi. On June 26, I told my parents. In the past, they've always told me about how much they support the lgbt+ community. However, when I came out, they questioned it. They kept asking about what I saw in girls and stuff like that. I want to come out to the public, but they don't want me to. They want me to hide it. They want me to wait till I'm 18 (I think they're afraid of what others will think of me since I'm a bi Catholic but idfc). I can't hide anymore. What do I do?