A wildly successful entrepreneur who was speaking at Kellogg PE/VC conference made the analogy of entrepreneurs to artists.
98% of artists are not successful. They struggle to make ends meet. Only 2% are successful. Yet all artists - all 100% - can tell you that it's all they want to do and that there is nothing else they would rather be working on.
If you have another option to starting a company, and you're having a hard time deciding between starting the company and choosing the other option - then, at your current life stage, entrepreneurship might not work out for you.
I think this is hard-core mentality, but it is the only way you can explain the tolerance for hardship to yourself and others.