You are not to old. Five years ago I started training martial arts again. I had only done it of a few months in my twenties and it was the only "sport" I ever e

You are not to old. Five years ago I started training martial arts again. I had only done it of a few months in my twenties and it was the only "sport" I ever enjoyed. It is great, as I really sucked at it, but so did everyone else. Five years later I am still not particularly good at it. But I am better than the beginners and it gets better every few months. But, the key thing is not what it did for my martial arts, it is what it did for my life. I am much more disciplined in everything I do. I have more stamina. I get up at least an hour earlier in the morning. I am not suffering as much from a mostly static job, sitting behind a computer all day (these days I stand). I take stress better. The list goes on. It has thought me to deal with the issues you list, specially: 1.2, 2, 3, 4, 5, 6, 8. I can't really say it will do the same for you, but if you find a serious club, where competition is not the focus, but collaboration. Maybe it could work for you too.