Am I bisexual?? How do I know?

I think is safe to say that I’m not gay but bisexual still seems like an option especially recently. It seems like I notice a lot of girls, seemingly even more then guys, and I’ve caught myself with more then a few bisexual seeming thoughts, daydreams, and even dreams. I’ve had a few intense girl crushes, so I just wanted some advice. It feels like my family doesn’t seem to be completely okay with lgbt stuff, so it worries me a little if I were to be gay or bisexual that they would respond bad. I also don’t know how my friends would react or how to tell anyone.

What do I do about this stuff? How did you figure out you were gay or bisexual? What advise do you have for these things? How do I go about getting a girlfriend? Recently I’ve been pining for a girl to date but I don’t know how to approach that. Thanks very much everyone!