The less thought that you give this question, the faster you can move on and improve, which is actually the most expedient course of action.
If anything, you'll only get another "chance" when you become another person. Frankly, your best bet would be to just move on, figure out what you did wrong, and improve. Over the course of this process, you'll find that there are plenty of great girls out there.
-Damian
"The train of life always leaves the station on schedule, whether you are on board or not."