1) "She's so special... beautiful...she was the one ect"- This is something we think often after we are rejected. We often unconciously think we missed out on "the only one". We think she was so perfect, so beautiful now I missed out. This often creates depression, bad feelings, and a sense of loss.
There are many beautiful women who are excellent matches for you. Reminding yourself of this fact can help you not feel like you have "lost" as much, making you feel better.

2) Projection- One way to deal with rejection is to attempt to NOT blame/criticize yourself harshly in particular for your unsuccesful attempt.
In this technique the goal is to come up with a PLAUSIBLE reason why you failed that is related to the 1)enviorment or 2) the girl. So you may save face for example by thinking that you were unsuccesful because (e.g she could have had a bf, maybe she was in a bad mood from (work ect), she might have shynees issues, perhaps she is not comfortable in a certain place). So here the goal is to avoid self-criticism about your "inadequacies".

3) Depersonalizing - Another way to handle rejection is to think of it as a failure from your METHOD, rather than certain PERSONAL defects in your traits/characterstics such as (lack confidence, uninteresting,unattractive, ect). So if you fail you can remind yourself that it is NOT personal. This woman likely knows just about nothing about you, and has only experience with the current interaction you engaged her in. Therefore, you can think of ur failure as from some sort of shortcoming in your method rather than your "character". I personaly find this helpful especialy when my mind is trying to punish me as unworthy and guilty.

4) Numbers game- If you remind yourself that it is a "game of numbers" it might be a helpful beleif.
You can think after a rejection, "that I am one girl closer to success". Alternatively, you can reason that in reality not all attempts will be succesful for a variety of reasons, so that you will inevitably have to fail sometimes. From this you can reason that failure is an inevitable part of the game and a natural part of the process rather than something "that isn't supposed to happen" or means "ill never win".