You will feel so lonely, because your non-entrepreneur friends are still in their corporate jobs, still with that paycheque of security, traveling, partying, living life. And you can’t join them. They will invite you to chime in the fun and they won’t understand why you keep declining — which you will obviously do for three reasons: (1) you can’t afford it (2) you don’t have the time and (3) you have better things to do and focus on — you eat, sleep, work, repeat trying to build this thing you care so much about.