Feel free to reach out and drop a line, you aren't alone and shouldn't feel like it. It's only failure if we fail to learn positive lessons from an experience.
It seems old fashioned, but the business model part of a startup is often the trickiest and the most unknown -- and worth figuring out, because ultimately the go hard or go home mentality.. goes home when they're cut off, or run out of cash. Faking it till you make it saying things are "great" like everyone leaves you where everyone ends up -- going home. Having real people around, not full of phony killing/crushing-it-isms is worth more than funding in a lot of ways, a good group of peers helps pick you up and keep you going.
To the poster, thank you, you're brave in being open and honest so those disillusioned by this kind of thing can't look away and flinch. Take your lessons forward and build something to take care of a problem that others want solved as well, not focused on the goals of investors.