You're not doomed.
You have standards, and honestly almost everyone does. It's okay to feel that you don't want to settle down just yet. When I was younger, I never had a boyfriend because all the ones that did ask me out I didn't see my future with, or felt they didn't want anything serious. I didn't have my first boyfriend until I was 20 years old, I had no social skills, very shy and some how I automatically knew he was the one I would share many moments with because of how comfortable I felt with him and now years later we're engaged.

I feel that maybe you just haven't come across that person. Once you do find that person, it's not that they're going to be perfect, but you balance out the good and bad within time. Sometimes it happens unexpectedly in different situations, when you're not even looking for someone.

I think the key here is what you mentioned, "I insist on dating the girls I want or nobody at all", ask yourself what is that you truly want?
Does she have to be someone you're more physically attracted to, or someone who looks ok but you feel comfortable with..etc.