The expectations, both from the world and founders themselves, are often impossibly high - afterall there can be only one facebook and one Google. Failure in startups isn't the same as failure in a corporate job. Startups are so much harder that if you make it to the first line of code you've already beat 90% of the people that want to do a startup. If you launch you've beat 99%. If you actually become ramen profitable you're a superstar in my eyes.
The problem of suicide and depression among startup founders is more pronounced than you might think, both because of the high expectations, but also because the founder is the one who needs to always be positive, egg others on, and never show weakness. Often while constantly doubting his (or her) own abilities and chances of success. This is incredibly hard and can end in catastrophe if you don't talk to someone about it. It even happened for a ycombinator company (http://news.ycombinator.com/item?id=859117).
Remember to enjoy the journey - it's fun, and if you fail you'll be held in extremely high regard amongst fellow entrepreneurs and HN'ers for having tried. Most people just dream, the people that actually try are stars.
If you have any questions, or just want to talk please contact me. My mail is in my profile.