24 hours from launching my niche aggregator and shitting bricks "I will not promote"

I have read so many inspiring posts from all of you and I cannot stress how much I commend you all for having the balls to follow your dreams and launch something that you put so much time and effort into, without knowing how it will turn out. The success stories inspire me the most. I have worked tirelessly (literally) on my niche aggregator that solves a real cultural problem, yet I cannot stop thinking of everything that can go wrong or like I will be the laughing stock of well......myself since I barely told anyone about it. Any tips to help get me through the vomit fest that is week 1.