Is there someone for everyone?

I don't believe in The One. I've found a number of people who love and cherish me. I'm sure you can too. It's not easy to learn to believe in yourself, but that's really all you need to do. Follow your heart.

Probably not exactly. Too many people think they "deserve" someone in their minds who are nearly perfect, no matter where they themselves are on the people scale, assuming there is one.

Men here on Quora have said they would not date an overweight woman even though they are overweight, for example.

That said, there are tons of people who are with someone you'd never expect for reasons we won't understand.

My best advice is to upgrade yourself and if you feel emotionally down about dating, then take your time and be picky. Only see women who bring you joy and show that they like you and are a good risk.

Not everyone wants someone, so in that way no, I guess. But I think the first thing you need to do is realize that there is not a one-to-one match-up of people. There is not just one person for everyone and if you miss them you're screwed. There are plenty of good people you could spend your life with, but if you continue to think about it with such pessimism it will drive people away from wanting to be in a relationship with you. Being "alone" is not a bad thing. You don't need someone to enjoy life. And again, thinking about it that way will drive people away from you.
I know how hard it is to not be in a relationship when it seems like everyone else is. But if you yourself feel so terrible about yourself finding a relationship then you aren't ready for finding that 'special someone'.
Do something for you, and spend some time with you. It'll be worth it.

YES there is someone for everyone (specifically you).  That "someone" is you. 

You need to be responsible for being happy, whether you're single or in a relationship.  As long as you're in a mindset of being "doomed" and only the special girl can save you,  you pretty much have zero chance. 

Until that alters, you aren't the right person for yourself or for the kind of person you want to be with.

"Doomed" is pretty strong language. Melodramatic, in fact.
You may consider yourself a tragic hero/victim, but if you can get past
feeling sorry for yourself you might consider upgrading your social skills
and going out and dating. You may never find "that one special girl,"
but you'll have some very nice experiences and maybe grow up a bit, too.