I haven't been black but I have been an entrepreneur and I have been depressed (at the same time). Being a hacker and an entrepreneur is extremely isolating. You are literally forging a path forward and everyone is a doubter and a hater and you'll find very few people who will believe in you. Don't let that stop you - build something you believe in, solve a problem, find someone who will pay you and then do it again faster.

It sounds like you know this already but you must hang in there. The feeling will pass with time... let it pass.