One thing I had to learn was that if I asked someone out and they said no or didn't reciprocate wasn't a loss or rejection.

Not only that, but you dodged a bullet. I thank women when they respectfully reject me. It's awesome.

Also, think about all the times you were turned down. Does any of that matter now?? Nope. No one involved cares at all if they even remember. I think something that might help with this is for OP to place themselves in a position where they reject others. They could experience the other side and see that it's not a bad thing. It's just that they think it's not for them and nothing else. And even in the rare chance that the rejection is seen as something else by the rejecting person, then even better because that's not just dodging a bullet but dodging an artillery shell.