We all need to be fulfilled and if you're not in the right job, you should change it. I knew a man who had several successful careers . He was a real estate agent, among other things, then he became a lawyer in his late 40s, and then he was an artist. He had a very fulfilling life.
I also have changed my 'career' several times and completely enjoyed each change.
You spend half your waking hours at work - it's essential that you're getting something out of it besides your pay. You only get this one life, so make the most of it. And don't be scared to make changes. Do what feels right.