"Do what you love and you'll never work a day in your life" or so they say. As a mid-40's veteran of multiple startups, I say do what you have a passion to do. If that's fishing, live to fish and do what you want to support that passion. If it's whatever you're working on, then you're good.
In your case, perhaps your drive and your passion are not aligned at this time. Once that's fixed, life becomes much better.