Need help finding who I am.

Hello,This is my first post in this community so I'm not really sure if this is the right place for this, but I need some help.I've been heterosexual since I was a kid, flirting with the neighbor girls since I could talk (btw I'm 20 years old now). I have had many healthy relationships with women, sexually and romantically. However, for the last two years or so I have had this tiny, nearly silent voice in the back of my head that has a lust for men. I've never had a sexual experience with a man, so I'm not sure where that voice is coming from. Lately this voice is getting stronger. I don't think I want anything romantic with another man, I think I'm just extremely sexually curious. Has anyone gone through this kind of thing before?To make things even more complicated, lately I've been lusting for my best friend of 7 years. Sometimes I think he could be feeling the same thing but I think that's just my hopeful imagination. I don't want to ruin any relationships and I know my parents would probably disown me (not that that matters as I am completely independent from them now, but just trying to put as much information out there as possible). But do you guys think I'm gay? I know this is something I should be finding out for myself but I just need advice. If anything, I'm bisexual, because I love women and I love sleeping with them. However I get this feeling that this isn't all I'm supposed to be.Thanks for reading and I'd love to hear any advice you have for me.