Some choice quotes:

Unconsciously, everyone expects a startup to be like a job, and that explains most of the surprises.

It’s surprising how much you become consumed by your startup, in that you think about it day and night, but never once does it feel like “work.”

I’m surprised by how much better it feels to be working on something that is challenging and creative, something I believe in, as opposed to the hired-gun stuff I was doing before. I knew it would feel better; what’s surprising is how much better.

Everyone said how determined and resilient you must be, but going through it made me realize that the determination required was still understated.

Read more at What Startups Are Really Like.