Don't worry, i can tell you there's someone somwher out there for everybody, BUT, you don't really have to find someone, because these things "Just happen". Sure, there's nothing wrong in doing things to increase your chances (Like online dating, trying new things, etc.) but don't look for someone just for the sake of being with someone.

You see, i'm 20 years old and i even hadn't have my first kiss. I used to be like you (No interest in anyone) and all of a sudden, i got more interested in getting to know people to see if we can be together.

Also, don't talk bad about yourself, don't try to find the perfect man for you, BE the perfect woman which everybody wishes to be with. It's an everyday work, becoming a better person you were yesterday, and believe me...
FIRST of all, i don't believe you could be not that pretty.
SECOND, looks are sort of important, BUT, there are two things on this:

1. EVERYBODY likes different things, although most people might like similar stuff, some like tall women, som short ones. From my personal point of view, i don't really have a "Type of woman", if i like her, i like her and that's it.

2. Let me tell you a story, i once met this girl who was average looking, and between us, her nose was quite funny, do you know Owen Wilson? Similar haha, it was sort of big and "sided". She once asked me something (I remember it was a stupid question, it answered it by itself) but i didn't mind and i answered. This way, i guessed it was just an excuse for talking, and hell do i love talking. So, we get to know each other kind of well, and after a few months i realized i gave a damn about her appearance or our age gap, i was in lov with this woman.

My point is, things happen naturally, don't force anything, but you gotta work on your self esteem and be the best you can be.

Blessings and be safe.