"Has anyone else felt this way? What have you done, or am doing, about it?"
I am catching up. There were two specific things I wanted to do when I was growing up --draw comics and write horror stories-- that I always avoided because they did not fit with my perception of a good JW. When I finally freed myself mentally, it still took some time to accept that I could now do both of those in good conscience. So now I spend some of my free time drawing and writing. It has come along very slowly, but I can recall the day I sat down and asked myself "what it is that you want to DO? What would give you a sense of fulfilment?" And the answer was easy: tell stories.
So I've worked on doing that ever since.
So my advice is: sit down and have a long talk with yourself about what you really would like to do. What do you want to accomplish? What gives you a sense of joy, of fulfilment? When you find the answer, start working towards those things as a goal. In other words, find something that makes you happy, and do that thing. And be happy.