I am good at programming, but I wasn't bad at chemistry either. I could have chosen to go study that instead, or gone into bioinformatics. I still could. There's plenty of software involved in modeling cell functions, which I imagine is pretty significant for curing cancer. Yet here I am, doing other stuff out of my free will.

I'm happy at my current job, but if I truly wanted to make the world a better place there would be more effective ways to do that (cancer research being one of them).