I think, and I could be wrong, but you have an idea in your head that there is a bar between success and failure. Success being; getting a number, hooking up, kissing, etc. And failure being not able to get one of those.

Those are nice goals. Fun goals. But if you are riding a cold streak, try to think of the goals as easier targets. Get a smile. Learn their name, find out their favorite band. Just easy things to know or discuss.

When you start finding that hot streak again, try to set different goals with each encounter. Have fun with it! Make it weird things, like what was their first car? Their first pets name? What book are they reading? Just anything! Learn 1 thing, or 2. It doesn't matter. The point of all this is really just to take your mind off how gorgeous this person is, and to share and enjoy something fun or new with someone. Not about the end result, which will undoubtably occur in due time. They will not sleep with you just because it's what's going through your mind right now, right?

It might be worth noting; have an out. Knowing what to say to escape if you feel like they're being cold or you get the feeling they just don't want to talk. This should really be a responsible concept to life in general, but always have a plan B. ;)

The point is, like OP is saying, change your perspective. Don't think of the failures. Think of the attempts and learn from your mistakes. It takes effort, and time, and patience. Were the Pyramids built in a day? Nah, so enjoy the experiences! I mean, If something is really clicking early on with someone, try for a number. Worst case is she says no, and guess what? You never had her number to begin with. But at least you tried and had a good conversation out if it.

It isn't all that simple, I know; but remember, it all starts with getting those first few easy and seemingly useless successes.

You can honestly take these same lessons, and apply them to general relationships in your life (if it's appropriate) to build better report with co-workers, bosses, classmates, customers, etc. Think of it as practice before encountering someone of interest. It's just that with people you are very attracted to, you forget this lesson and focus on picking your jaw up off the floor, or that you had stopped breathing at some point and suddenly remember to. Or a combination of both.

Sorry for the huge long rant.

Tldr; lower your expectations of success and eliminate failure. Think of every encounter as practice for the next one.