You will make more money plugging away diligently at a career in the Fortune 500 than you will spending the same 30 years in startups. I use the word "will" here in the same same sense as you "will" win with KK facing 72 unsuited. Anybody here capable of starting a company is equally capable of walking in the door at six figures in a big company.
The reason this "upside" notion is so pernicious is that it's fed by powerful biases. We read about the successes. Even the failures we hear about, we're reading about them by and large because they were "successful". The overwhelming majority of startups won't get fundng, won't get significant customer traction, won't feed their founders 2 years out, and won't get enough press attention for us ever to hear about. Their stories are also boring.
As for what you accomplish with your life, remember this: over 10-20 years at a big company, you will build things that people will use. Over the same years at a startup, you're inevitably going to pour your heart and soul into code that nobody will ever see. If you're unfortunate enough to "score" any funding, even after the company dies, you're probably not going to get to do anything with that code.