You're not the only one.
Confessions is s song by Lecrae that gets right to the heart of what many millionaires have said to him.
While I am new to investing, my heart has been concerned with what would become of me if I did end up making more money than I knew what to do with. And I have come to the conclusion that, above all, I must guard my heart from the love of money. I can't live for its sake. That is meaningless. The reason I am making the money is so that I can do what I love and that is doing what I was created to do, fulfilling my purpose in life.
"Adam", John, or whatever your name may be, you were made with a purpose. To glorify God and enjoy him forever. He has set eternity in your heart. To live for fleeting things hasn't been satisfying you and it never will. So many people here have pointed to philanthropy because the human sould is eternal and supremely valuable-- that is the best investment out there. Yet if your own soul is not satisfied in knowing the God who made you, then no amount of giving will ever be enough. Nothing will be enough without him.
"Our hearts are restless until they find their rest in You." - Saint Augustine
If you want to talk more, feel free. I have resources and a listening ear.
I pray peace over you, and the rest that comes from knowing Christ Jesus.