Only 15 props in six months, shoot, I'm sure I did that in the first 2 weeks. lol. i used to buy them 5 at a time. Sometimes they only lasted 3 seconds. I would say to keep at it, get out as often as possible and one day it'll click. After 5 months I am getting pretty good, and rarely crash or break props, but still have a long way to go.

Eta, I'm 41 and enjoy playing video games, and I'll tell you That it took me what I thought was a long time to "master" or even get the hang of flying. Practise and more practise is needed to train your thumbs to do what is needed. It only looks easy.