If it's about the porn, you could watch "pink and white production", they are authentic and with joy and love.

But it's realy common to find porn not arousing. I am sometimes very sexual, but can't watch porn bc I don't like it. (Other times I like it, even if I have no desire to actually have sex)

There are asexuals that say they sometimes feel sexual tensions (Gray asexuality I guess?) , but no desire to act on it. I think they would welcome you. Seeking out to other asexuals might be a good step.

The good news: you don't have to give yourself a label if you don't feel comfortable with it. If you are heteroromantic you can say you are "hetero" if that makes you feel more save.
Second good news: If you think asexuality fits you now, than you have every right to claim that label for you. If you find out that you love sex: enjoy it, adjust your label, and maybe spread awareness for the asexuals under us.