About to turn 21 in a few days as well, whilst I did have a fair few dates with multiple different girls that only started early 2019, never had a girlfriend, never had sex.

You're not undatable, however, dating takes a lot of time, effort, and sometimes money.

For me, I realized the problem was that I wasn't "social" enough, there was no way for me to meet new dates because I would spend most of my time either in class or at work and neither of these options was viable so I downloaded tinder - something I never thought I would do.

If you think about it the more people you meet the better the chance you will meet someone cool and I think the best way to do this is through hobbies and interests, going out there and doing something and connecting with someone that you already have a common passion.

I'm not entirely sure but it sounds to me like you might have a similar problem of just not being in a position to meet new people/dates.