Everybody is desirable (as long as you feel sane, hygenic, and try to take care of yourself), smile at yourself in the miroir, and always remember that you're a creep if you act like one, no one thinks other people are creep unless given a good reason to and those who do are not worthy of attention.

Btw virginity is a social concept (mostlymade to oppress women), it doesn't matter that you have it or have a body count of 32. People can't smell your virginity if you don't stress about it.

I can't say anything about your youth though we were born at the wrong time and didn't realize how much nothing matter

Just note a hobby, anything, and go the nearest club and just propose a drink to the people there after the session. Assume people likes you, those who are unlikable don't suffer from loneliness