Please help me!!

I’m very sexually confused and I don’t know if I’m straight or bi. I am attracted to men but I don’t really know if I’m attracted to women. I know that sounds stupid, but I have fantasies and they’re very confusing. I can appreciate anyone’s beauty, but I don’t necessarily want to have sex with them in that moment until I end up dreaming about it. I’m in high school in a small town where things like this are a pretty big deal, so I don’t really want to label myself if I don’t have to. I’m just really confused, and I don’t know what to do or who I am. How do I know if I’m bi or straight?