I just wanted to say: when I was 19 I felt the same way you did. I thought the it was impossible that I would ever have a girlfriend or have sex. And it almost was.
But even with just slightly-below average looks and a bad case of shyness, low self-esteem and little confidence I had a couple short term relationships, several one night stands and a few women friends. And by some mystery that I still can’t fathom, my girlfriends and even the one night stands were with very attractive women.
I’m 59 now and the opportunities are few and far between. I don’t really need sex now though I won’t shut the door completely on it.
But yeah, with some effort, taking risks and a little chutzpah you may run into some woman you really like so much that you are willing to put yourself “out there” and take a chance and talk to them, get to know them a little and ask them out.