I feel like a fraud (NSFW for sex talk)

I don't want sex with anyone IRL. It's not that it repulses me but I don't see myself do it with anyone. I wouldn't get physically sick from imagining it but I would never accept.

Though there's a but:

In really random moments I tend to have brief moments of lewd sex with a person (but most often a fictional character...). Like maybe 10 seconds of this. And then I'm like Am I really the person I think I am ? Am I really ace or did I just "not meet the one" ?

On one hand I don't wanna do it myself. I'm totally fine with romantic interaction, kissing and slight touching but nothing lewd like that. I don't wanna get sexualized by anyone either.

On the other hand I am okay reading smutt (written or drawn, never watched though it makes me uncomfortable especially when it's a couple stuff). I don't consume too much, like maybe 1-2 chapters when I'm "craving it" (more curious than anything.
I'm also okay imagining doing it with a fictional character from time to time.
I have weird fantasies (nothing too kinky like BDSM, more like obsessive love ??? yanderes of sorts, dont judge), etc etc

IDK. I'd 100% be okay with a sexless relationship/marriage but IDK if I'm saying it because I'm young (19) or if it's a "phase" thing (though I've been like that for a while. Even with my only bf (now ex) I was really not comfortable when he tried to talk about sex)

https://redd.it/1x4w3oo
@asexualityonreddit