@Melamyl It might help to not think about sexuality markers (like demisexual, asexual, demiromantic, etc.) as realms that are distinct from one another, but rather as a spectrum! These identities aren't set in stone, and applying a marker to yourself and your experiences is only a good thing when it feels good
to you, like when it brings relief, ends confusion, helps you find community, and so on. It isn't mandatory to name your sexuality, especially not when (as you've mentioned) your sexual desires vary from time to time and from situation to situation (and that's nothing to be disgusted by or worried about, sexuality is very fluid for most of us!). In case you want to flesh out your sexuality concretely without looking into labels, this checklist we've made might help:
https://www.scarleteen.com/article/advi ... _stocklist
Also, I noticed you're using the word "lust" to describe your sexual thoughts and desires, and that word is connected to like, ideas of sin and impurity and wrongness, right? I think it might help to think about why you associate sexual desire with such ideas--this is a reflection of purity culture (check this article out:
https://www.scarleteen.com/article/qa/w ... ationships) and it may be adding to your negative feelings surrounding your sexuality. It's valid to be sex-repulsed, but sex-repulsion doesn't have to involve those associations. I think challenging this aspect of your thought might help with the distress you experience when you have sexual thoughts and feelings (which, remember, don't necessarily "cancel" your place on the ace spectrum!). Here's a handy guide to asexuality:
https://www.scarleteen.com/article/rela ... ity_primer.