@scanlime If sex was nice at some point, then you aren't asexual by definition. I am guessing you are the sort that needs a person to push the right buttons to make you fully open up, and such a person doesn't come along often. If so, that's perfectly fine, you're a treasure to be unlocked.
BTW, your brain will likely take a few months to adjust from SSRI dependency and its sex drive depression. Docs significantly underestimate time scale.