I still do things and make things, but they aren't start ups. Some are school projects, others are for my day job, and some are just for fun. I read HN because there are great people with interesting opinions on stories I want to read.
That said, I feel the same way. I want to break out and do things. I get that feeling sometimes, and it hurts to feel trapped, but then my paycheck goes through and I log my 40 hours and go home.