Do you want to see what you are made of? Wait until you reach the tough times. On the happy ones, it’s easy.
If your startup doesn’t work, change. Modify yourself. Think about something else, take a u-turn (a legal one please!), change the direction. And, most importantly, do it before the funding ends.
It’s not worth to keep trying to do something that doesn’t work. Maybe it’s one of the abilities that a business man (yes, you are one of “those guys”) needs to have: to know when and how make decisions.
It is painful, I know. But a pain in the neck is better than a pain in the ass.
You do have, obviously, one other option: complain about your “bad luck”, don’t do anything and see how your startup sinks (hopelessly)
If I want to cry, I would rather go see a sad movie.