What I think has been missing in your life: Values. Specifically this one
“Of he to whom much is given, much is expected.”
You need to find a way to be of services to others. Hard physical labor is an excellent idea, but will this program benefit others in some way? Is it a charitable endeavor?
I predict that you will not find happiness until you look around the world and find something you want to change for the benefit of others, then apply the substantial advantages you have received toward cleaning up that issue. It could be almost anything, from stopping child abuse to finding a safe supportable way to convert human waste into fertilizer.
I am reminded of Tom Hanks in Saving Private Ryan. He knew that Ryan would be messed up when he had time to think about all the sacrifices made on his behalf. With his dying breath he gave him the answer: “Earn this.” he said. I’ve always thought THAT was when he really saved him.
A little LOL for the older crowd, when I first wrote this, I wrote “Private Benjamin” instead of Ryan. Subconscious thought is amazing, ain’t it?