I answer a very strong yes to all three of those. Always have. But a startup, despite my always having worked in them and run one of my own for three years, was resolutely not a good idea for me.
It took a lot of self-discovery to see myself not as an entrepreneur, but as an artist, and it's frustrating, because it sure took me a while to admit it. I spent all my time and money and effort trying to be successful as a startup founder, and expecting that I'd eventually feel the spark that I know can drive me. But now I look at the creative work I do on my own, even though I still have a full-time job, and I feel the same connection that Michael describes here, which I had chased for so long.
The irony is that pretty much every idea I have uses the technical skills i built as a startup founder. But hey. Time to do what I always should have.