The only person who can definitely say what your orientation is...is you.

Now, having said that, I know that it can be hard to pinpoint your sexual orientation, maybe even more so when you're not certain and you have no sexual experience to provide a little extra insight let's say.

From what you say about porn, that doesn't necessarily have to mean anything because women of all orientations watch lesbian and gay porn. Many women find straight porn a turn off because of the overtly demeaning, violent behavior in it or even just the general vibe of it, that is still demeaning and male gaze oriented, even if not overtly. Plus, many people, of any and all orientations, actually find the visual of both straight and queer porn arousing. So it could be that or it could be you're bisexual or a lesbian.

I'd say what can be more of an indicator are those dreams and what you imagine outside of watching porn. That does make me think it's likely you're not straight.

As you know, sexual orientation is on a scale so you can be anything in between straight and lesbian. For example you could be bisexual with a stronger preference for one or the other, you could be closer to straight or you could be a lesbian.

What's also something to take into consideration is if there's other issues that may be affection your feelings towards sex, relationships and orientation. This is something only you can know.

For ex, you could be asexual/aromantic and that's why you don't want sex with another person, which is perfectly fine. At the same time, it could also be that something in your past(it could be something clear or something small that you wouldn't imagine could have impacted you) has made you weary of men, sex, intimacy, being vulnerable with another person and so your brain keeps you safe by making you feel like you just don't want those things.

Much the same way, you could be bisexual or a lesbian and something like deeply internalized homophobia or fear of reprisal might be holding you back.

So, you see, there's a lot of possible nuances to consider, which only you can clear up.