Anyone else just feel...tired after playing?

I'm going to preface this by saying I am not good at this game at all. Compared to a lot of people here, I'm pretty much bottom of the barrel. I started playing again after a long break (like a year or so) and I'm Silver rank on 3 characters. I don't expect to ever reach beyond this rank. I try to improve my gameplay but every day after about 2 to 3 hours of playing I just feel tired. Like mentally and physically exhausted. My fingers ache, my eyes hurt, and I don't feel like I've gotten measurably any better than I did when I started.

Is this how "improvement" or "practice" is supposed to feel? I can't point to any particular thing that I can say I've done better now than I did 3 hours ago when I booted the game up, even marginally. I just want to commiserate with people and see if I just need to take another break again and come back when I'm more mentally ready.