Looking for advice on how to talk to [m]y girl[f]riend about possibly being bi

Both of us are mid twenties, currently in an LD relationship. Also if this is not the right/a good place to talk about this please direct me to somewhere where I can get advice/hopefully understand myself. She’s bi, has been with women, and has significantly more partners than I do, but that’s a whole other can of worms I know to be immature but can’t shake :(. I’m hoping her being bi might make this easier but also possibly harder??

As far as she knows(?) I am straight, but for about a year and a half now I’ve been drawn/interested in an experience with a guy(s). I can’t explain it - I don’t find men more attractive than women, getting my own ass fucked kind of scared me (although anal plugs/fingers are super fun). I don’t exactly want to kiss a guy either (facial hair might feel weird I’m scared, despite having it myself), but I’m just fascinated(?) by anal sex.

Ive been playing with my own ass since I was in my teens, more so later with the freedom that comes with no roommates, and have more recently been looking at more gay/bisexual (mm/mmf) porn and finding some really hot, but not much of it. Say if I were to look at 10 posts of gay sex, 1-2 might be hot, where as a higher percentage of “straight” posts I’d find attractive. Is this homophobic? I’m so confused sorry.

I think the other thing is that I look NOTHING like a stereotypical queer man. I’m tall, hairy, shaved head, deep voice, fairly muscular I think. Obviously stereotypes are stereotypes but it feels confusing.

Once again apologies if this is the wrong area to post this but much love to anyone who can give me advice on how to talk to her about this, and advice on what I might be experiencing/validate it? Really confused if this is normal for straight guys or if I might be bi. And if I’m bi, I’d feel guilty about not being politically active, especially since I have few queer friends (or friends at all) and also haven’t suffered like so many queer people have.

Thanks <3