This has been proven wrong time and time again. I'm not trying to be hostile here, I promise. But getting stronger and in better shape will objectively make you a better person on a biological level. You will experience improvements in hormone levels, reduced long term stress on a chemical level, and the benefits of simply being decently strong pay in spades, especially as you get older. This isn't even to say anything about simply enjoying seeing yourself improve, which comes with time, and liking the way you look more.
I'm not suggesting in any way that everyone hop on a bodybuilder routine, and hyperbolic statements like "I don't have time to spend two hours a day in the gym" are meaningless. Even something as simple as three 45min sessions a week with actual strength progression will improve your quality of live immeasurably, given time and effort.
Bringing some ephermeral combat scenario into getting fit is always some weird cope that people give themselves to shirk the idea entirely. If your'e that concerned about a fight, then some type of martial arts is what you should be focusing on anyways. It has almost nothing to do with someone lifting weights to improve themselves. It's like telling someone who boxes "Heh, let's see how that right hook helps you in wartorn Libya when you're being shot at." It's just a cope comparison.
Again, any anon reading this, I'm not shitting on you. But getting fit will improve you.