@Joshua
No sir, that's all normal descriptions of normal-people anger, and normal coping methods thereof. Punching a thing so hard you break your hand is in fact NOT normal. Sounds like you are better adjusted. Frankly, anyone who pretends they haven't broken a thing in a fit of temper is a fibber. To put this in perspective, I am a person who most people seem to believe does not break my cool, ever. I am famous with people I have never even met for being the most chill person around. I have never broken my hand, but I have in fact punched an arm-sized chunk out of a punching bag in a red-tinged adrenaline-fuel murderous fury. None of those adjectives are figurative. This does not mean I am a bad person, it means I got angry that one time and broke something. People pretend that anger is a thing that doesn't happen to good people, but that's not how it works.
May I suggest volunteer work? I find that anything which has a measurable positive effect on other people will give your life meaning, however slight. A soup kitchen, even. I did work with people with severe disability, but I had extensive prior experience from Family. The thing is, substance is up to you to define. A life doesn't necessarily "gain" substance when you get a job, or buy a house, or get married, or win a Pulitzer. There are plenty of people for whom "substance" means living in the woods while contributing nothing to society and just fishing for the rest of their life.
Is there something you expected to have by now that you lack? I'm poor as balls, but I have a family. I didn't expect to be financially wealthy, and therefore I am not feeling a lack. The best starting point is: What do you feel, specifically, is missing?