I really need to know if i am asexual

(I read some of the posts to relate and find out if i am asexual or not, but it did not feel exactly like me, so i had to ask)

I am 22(F) , and I didn't feel any sexual attraction to anyone, never dated, kissed or held hands with anyone. So far it fits.. However, idea of sex feels right to me, and i think about it more than i like to admit.

I read that having fantasies could still means that i can be asexual, but It is not just the idea of it? I imagine myself in that situation and it is exciting, I watch and read about sex, and I can get aroused. Action of sex and doing it with someone is something I want to experience, but I can not like anyone in that way. I thought about being demisexual because I don't look at people and say this person is someone I want to fuck or something. I feel like i need to get to know them to feel attraction, but I didnt have the chance to prove it.

I also know that being with someone is something i can never achieve. Not that i want to be alone, but I just can't. I tend to run away when someone wants me romantically and sexually. I feel really uncomfortable at a point my hands shake sometimes.

So, what this makes me, am i asexual because I don't feel attraction to anyone? Or, Am I demisexual with no "right" person? I really need to know please.

https://redd.it/1x8g8qj
@asexualityonreddit