Bisexual

I feel as if I might be bisexual, just based on who I’m attracted to and how I feel internally. I have this fear though, that if I come out fellow bisexual people at my school will kind of gatekeep it and say I’m too young to know my sexuality, or that one of my conservative friends will pull the “oh do you like me then” card. My parents were so supportive when my older brother came out as trans, but I’m scared they’ll think that I don’t mean it when I say I’m bisexual. I’m just so confused and I’m not even sure if I qualify to be bisexual or not.