I am 17 years old and I'm missing one ability. My concentration. I am a very strategic and I believe smart person. I play table tennis and because of the lack of physical skill, I used my good strategic skill. I got a very good gameplan and I knew where to hit and place the ball everytime. I played hearthstone and was really good at remembering something. Nowadays I lost these abilities and I am just feeling lazy in my head. I can't concentrate over 2 minutes anymore. I am not an expert, but could it be that i do not have enough sleep? I can tell you sth when i was 15. My week was literally going to school and playing football, drums and table tennis. In free time i played a lot video games with my friends. TL;DR : I lost my ability to focus on sth over 2 minutes. So if you have specific questions, i will answer them all, no matter how deep the questions goes. I hooe i can answer them quick.