You didn't become stupid, but lost your confidence. Life is always at a low point for some time, and basically more than 85% people have it. At this time, it's up to you. If you are discouraged from now on, you can imagine the future!

Although I don't know how to learn, Dan, I hope you can stick to it, think more and practice more, so that you can make progress and take your destiny into your own hands! Come on! I believe you can succeed!