21 year old male here... also never been in a relationship. Of course I've had girls like me but they weren't really my type, all the girls that I do like dont like me back, and all the girls I dont like are obsessed with me, its a weird dynamic. So I suppose I could have been in a relationship if I wanted to, but I just didn't really like the girls enough to pull the trigger. Are you the same way? Have you had guys ask you out and you just didn't like them? Or have you never even had a chance at a relationship before?
That is not enough information to answer the question.
If you are 21 and about to graduate from MIT at the top of your class in bioengineering, you are fine. If you maybe went to community college and work as a bartender, you might have a problem; if you are seriously overweight, you might have a problem.
I'm 21 and have only had short flings (mainly based of sex) But these girls I wanted relationships with. So yeah 21 year old man never been in a committed relationship. Most of my dating isn't successful.