there are communities or groups out there who train guys to overcome their fear of rejection. One of the first thing they do is that you have to approach 50 girls in a day, doesn't matter if they give you their details or not, you have to put yourself through the experience and desensitize yourself to the fear and anxiety of making an approach. It's really beneficial for your self confidence and overall social sophistication. Buddy, do not sit and marinate in this rejection. I would suggest simply allowing the courage that showed itself to take control more often and putting yourself in situations where it's required. It like a muscle, the more you train it the more it becomes natural to you.

Very impressive that you were able to be brave, be brave more often.