One answer: "only you can decide your orientation".
My opinion: "sexuality is complicated, especially with mental health issues. I used to think I was asexual, but this was due to a combination of OCD, and avoidance. It turned out I definitely, categorically wasn't. I also don't find vaginas particularly attractive, but that's fine, because I don't really get to see them during sex, unless I choose to. They feel great, they look, less so (to me). "
My opinion further, even more risky: "you probably won't know until you experiment. This is going to piss some people off, but you may have to slightly push your comfort zone. But don't do anything you don't feel want to do (there is a fine line there, but a line, nonetheless. I have crossed it, but decided I had to in order to figure stuff out). Find a partner who is willing to take things slowly. Be assertive about what you will and won't try up front.
The reason you can't tell from imagery is that everything *feels*experientially very very different to how it looks. You say you find people physically attractive, so if I were to guess, you likely aren't asexual, but nobody can make that determination for you."
Ultimately, nobody can say for you, but I wouldn't risk adopting an identity personally (identities are very powerful things) without having tried stuff you might be interested in.
My opinion. Nobody kill me.
Am not saying you should do anything that makes you uncomfortable. You should be in control of what you do, and what I (or anyone else) thinks should have no impact on you.
And you also don't want to have a ****ty experience, so be very careful who you have that first experience with, imo. Different people make a world of difference to how things go.