[luminarious]

I'm not entirely sure your negative opinion of getting rejected is justified. I feel the direction of the feedback cycle is entirely dependent on the given person's general mindset.

As a positive example, my weak point is talking to girls. I try to talk more to them (or to more of them) to get experience. But since I'm not too sure of myself, I don't come off as pushy or overbearing, so the responses are generally positive, just because of the attention they receive. Which makes me feel more comfortable the next time I try to talk to female strangers.

[forensic]

You aren't reading very closely.

In vivo desensitization is what you're describing - slowly facing your fears piece by piece.

Rejection therapy is something else, where you actually attempt to be rejected X number of times per day. If you aren't rejected, you now have to do something that will get your rejected. It is essentially a defence mechanism to avoid true vulnerability.