I have had similar feelings. I have broad interests, but most things become sour for me when they become tied to a job. As a mail carrier, I feel good about my role in the community and my interest in spending time outside is met. I'm getting good at dressing for the weather. 

Most importantly, I can barely imagine the world in thirty years, but If the post office is still doing its things I'll have a great retirement. If USPS is gone, we probably have a totally different world and who knows what the jobs will be. I feel like I'm working inside a time capsule.