Hey there,
Your post was a little unnerving to read because you've just described exactly where I was two years ago!
For me, even once I was pretty sure I was aromantic, I kept doubting myself and thinking that I wasn't aro enough because I wasn't completely romance repulsed. But like Leia said,
If you feel like the term aromantic (or anything under the aro spectrum) fits you, you are aro enough. I think it's normal to have doubts about your orientation, and you can call yourself aro without being 100% sure.
When I was questioning my romantic orientation, I was sort of waiting for an epiphany/"lightbulb" moment because that's what happened when I found the term grey-asexual, but coming to terms with being aromantic turned out to be a slow process. Questioning can be really confusing and scary, and there's so much pressure to know exactly who you are, but you can try on a label without committing to identifying that way forever.
So, don't put too much pressure on yourself. You can call yourself aro even if you have doubts, but there's also nothing wrong with being questioning.
Best of luck!