>>9 This, yes.
Asexuality is a thing and it's perfectly okay.
(I don't think Gray-ace is a thing though - you either experience sexual attraction or you don't. There's no logical reason to measure how often you feel sexual attraction.)
If it's really a concern to you, there's always a possibility that some medical issue is causing it, such as a hormonal imbalance. You can check with a doctor to get that tested. (Some ace people get pissed if you suggest it's a medical problem, but let me be clear: being ace is not a medical issue. It's not something that can be "fixed", it's just how they are. But for some people, the lack of a sex drive can be an indication of something.)
You can even discuss it with a therapist if you're really unsure. But all in all, it's not a bad thing to be uninterested in sex. And it's also absolutely okay if you choose to never have sex. Never make yourself do something you're not okay with.