NSFW:Confused about my sexuality?

I’m looking for advice from people who’ve experienced confusion about their sexuality post teens. I’m in my mid-20’s and have had boyfriends in the past. I enjoy sex and am physically attracted to men. At the same time, I’ve found myself becoming increasingly attracted to women, say over the last 6months to a year.
I’ve developed feelings if you could call it that for a female lecturer of mine. I think about her a lot. Most of my fantasies during masturbation now revolve around females, her in particular.
I’m feeling very confused at the moment and don’t really feel I can talk to anyone close to me about it – I guess I’m not fully comfortable with these feelings, having not gone through this before.
I’m beginning to question if I’m bi-sexual. My heart tells me labels mean nothing. I guess I’m just trying to get my head around this and would appreciate any input from someone who understands
Thanks for reading