Actually, it sounds about normal for your age group. Most guys are just out to have fun (fun, meaning chalking up as many "conquests" as they can get). They aren't into wanting to have relationships - they really aren't mature enough. I'm sure you know that women mature earlier than men do, so we're much more eager to have a relationship that lasts than men are.
This has nothing to do with you, so don't take it personally.

It's just the nature of the 'beast.' And I'm sure there are some guys that are more mature than others but I guess you just haven't found him yet. LOL
I wish you the very best. Take care and God bless. Hugs, Lee