Babes who are Bisexual

So I've always identified as straight. And I've always only had sexual encounters with men. But, ever since I was 14 (I'm now 20), I've always known that the only porn I can get off to is lesbian porn. I think ive always been a little confused sexually. I know for a FACT that I am sexually and romantically attracted to men. I've never been romantically attracted to a woman, but I've met several women in my life who I did feel sexual feelings towards. The last few years I've been identifying as Bicurious. Because I am definitely curious. I guess what I'm asking is... How did you know when you were bisexual? Am I just in a phase? I feel like I've been confused for a long time and most of my sex dreams are about women. I even have to think of women sometimes to get off in bed..🙈 Any advice? (I'm in a relationship with my loving boyfriend and he knows I am curious)