This is why you don't work for a startup because it's a startup. Find something that you are passionate about. Work in that area. Be it freelance, at a startup or at a larger company.
Too often people stay at startups because it's the new cool, and anyone not "doing a startup" is apparently an idiot. It's very far from the truth, and my life was a lot happier once I realised that.
For a long time I thought I wanted to work at a startup, but it turns out that what I want just sort of correlates with being a startup. As long as I can be creative and build things of value for real people while improving my skills without being micro-managed, I'm happy.
I wanted to work at a startup because I saw it as the fastest path to personal growth. I'm sure it's possible to grow in big companies, but I did some analysis and decided that a smaller company was the best bet for me. Small team means big responsibility and many hats. And I have to say, I learned a ton while I was there. I don't regret it for a second.
Too often people stay at startups because it's the new cool, and anyone not "doing a startup" is apparently an idiot. It's very far from the truth, and my life was a lot happier once I realised that.