I often face those issues as well. Especially when you're part of communities that worship people that get a seemingly unrealistic amount of stuff done, or are unusually successful.
My first bit of advice is to take a break. Forget start ups, forget technology, take a weekend to sit around and be a slob. Lay on the couch all day and do nothing. Go on a hike, sit in the woods, put the computer,technology, business into perspective. Maybe this is only relevant to me, but it seems to help.
As for the analysis paralysis... I suffer from that pretty badly. The only thing I've really been able to do to get around it is say "fuck it, worst case scenario, if I make something that sucks, at least I've made something. Best case scenario, I've made something that's great and made the best decisions I could." Sometimes you have to just hack stuff together, you can always change your direction later right?