Don't worry about trying to define your sexuality at the minuite, though it sounds like you could be bisexual. I am bisexual but was 110% convinced that I was only into guys for the same exact reason for literally YEARS. I could only picture myself being in relationships with guys and never women!
My advice is not to think about whether you like girls or guys but to consider whether you would date or be intimate with SPECIFIC ppl, like.. say in the lesbian porn you watched you liked a girl called 'Max' or 'Bella' or something (idk man) just picture yourself with those individuals regardless of gender. Also, ppl in porn, unsuprisingly, aren't ussually marriage or relationship material so you might find that if you watch romantic lesbian films or other romance films with straight girls, that you like some of the women and could possibly want to be in a relationship with one of them! I was only ever really attracted to girls in real life after accepting (even just a little) that I liked girls in films and tv shows. So if you're convinced that you're straight -not saying that you're not
- but that closes you off to liking girls quite a lot.
To be honest, fantasies about being in committed relationships with girls aren't often that EXCITING, I'm pretty sure that everyone thinks more about having sex etc with ppl than holding their hands or whatever. I think that relationships can seem cooler when they really happen than in your head.
Also, due to our heteronormative society, you've presumably never really seen lesbian relationships in books, the media, conversations, etc, and therefore never really thought about them. It was totally new terrain for me too ( and probs most lgbt ppl idk) cos it's not something that you're expecting or that you have any idea how to navgate. I still don't lol !
Tbh, it's really good that you can talk about the fact that you're a little confused, even if it's just online. I couldn't even think about it for ages. Not asian or but I have a friend who's bi and muslim and I think she's struggled w it quite a bit so I think it's a common issue- good luck.
By the way, it's fully possible that you're straight and that I'm just automatically picking up on things which could mean that your bi beacause of my own experiences. Just remind yourself that there's no pressure to make a descision regarding your sexuality cos its literally NOT a descision lol! Good luck