If this gives another perspective, I am aromantic, do not want a romantic relationship, but would be ok with romantic-coded things in a close platonic relationship. So, while I have never dated, kissed anyone, etc. I do enjoy and find support in holding hands and I am not repulsed by or averse to the idea of kissing. I had to picture myself in a romantic relationship with all of the feeling you find in books and movies that I can enjoy in those forms of media to realize that no, I don’t want that with anybody. So my suggestion is to think about what you really want a relationship to feel like, not what you want to be doing in it.
However, to answer your earlier question, I would say that it it totally ok to identify as demi based on a gut feeling! After all, in my experience that’s the best indicator. If your gut is telling you that you are demi, and you think that you are demi, you are demi!