Quit fearing rejection.
Rejection is a good thing.
It means you did what you wanted and she wasn't with it, which means she isn't what you want.
If you're not getting rejected, it means you're not doing it right.
Now, if you're doing what you want and getting what you want, this doesn't apply to you. You probably don't have a perfect batting average, but that's my point.
You don't get every girl. But if you go after every girl you find attractive, some will reject you and some will sleep with you and some will marry you and one won't divorce you.
If you're not getting laid and no girl has turned down your advances, it's because you have not made clear, unambiguous moves towards getting into her panties.
Reach for her crotch. If she turns you down, she's rejected you. If she lets you touch her, you're in. But you can't get there if you fear rejection and don't make the move.
Think of it this way, even if she rejects you, you're no worse off than you started. In fact you're better off because you acted like a man for once.