Confused about my sexuality

Since I was 12 I’ve identified as Bi. I really really like girls. But I’ve mostly dated guys. But I get bored with men pretty easily break ups hurt like we were friends who no longer speak and I can’t think of a time I enjoyed a sexual encounter with a guy I’ve honestly just told myself I did because I’m supposed to. During my last relationship it was like a switch flipped. I was bored and didn’t enjoy him at all and I only fantasized about sex with women. Am I actually gay? I’m okay with that truthfully I’m just worried people won’t believe me...