@Whatwouldscullydo
There can also be medical reasons for a lack of connection with people , lack of a sex drive in adults etc
Depression , brain tumors, having your puberty blocked by powerful drugs.
Whereas there is no doubt that asexual people exist , perfectly healthy and happy, we can't ignore that assuming you are a sexual and potentially missing order health issues is not necessarily something we should be doing without question.
What do you mean by "no doubt asexual people exist?" I have a lot of doubts that asexuality is a sexuality. There are certainly people who don't experience sexual desire. But as you say, that can be for medical reasons. Hormone imbalances can be common too as I've read accounts of both men and women having no sex drive. Then after years discovering they have abnormally low testosterone levels and experiencing sexual desire once they have their levels raised.
I think asexuality can also stem from psychological issues. In the linked article a woman who had been in a relationship with an older man who pressured her into sex when she was too young, identified as asexual. Whereas I read that and felt like she was having an understandable response to trauma. And she should ideally have good counseling to help her deal with that.
There is also the issue that lack of sexual activity is quite bad for various aspects of your physical health. You don't have to have partnered sex, but if you aren't at least having and satisfying urges to pleasure yourself. Something, physical or mental is very probably wrong. And will lead to further problems as you get older.