I just approahced and had a 4 min conversation with a hot woman and in the end asked for numebr and she said no. I feel bad. How should I think about it?

First, take a second and recognize what actually happened.

You approached.
You had a 4-minute conversation.
You asked for the number.
She said no.

That's very different from:

Things to remember:

Questions to ask yourself:

If the answer to most of those is yes, then this was a successful rep.

The biggest mistake now would be:

"I got rejected, therefore I shouldn't approach."

A better conclusion is:

"I approached, got rejected, handled it, and nothing terrible happened. Now I do it again."

One more thing:

The man who approached today is already ahead of the version of you that stayed silent. That's the version you want to keep becoming.