I have confidence in me

I realized today that I'm not as confident in myself as I thought I was. In many things I'm confident that I can do whatever I set my mind to. When it comes to music though, like playing the piano or learning music theory I feel like a failure. Which is not true. I know a lot about music and more then I realize. I can read music even if I feel like I can't and I can play piano even if I feel like I can't. Sometimes we are just to hard on ourselves and we just need to give ourselves a break.