Reading between the lines a little, you seem to beat yourself up or go within yourself in response to failure. This is a common trait with perfectionists, who often want to feel like they are without flaws before they open themselves to the world.
I'm basing this on this post and the post you linked to about imposter syndrome, although that post appears to be from another user.
If my description seems accurate, I would recommend dealing with anxiety/perfectionism/self-esteem first by learning about it. If you want, throw up an anonymous website that tracks your journey. Self-help is certainly a profitable market. Developer self-help might be an interesting niche.
Without being centered enough to weather failure with grace, you're going to have a hard time being a successful entrepreneur. Once you have it worked out, you'll be a different person with a better sense of who you are and what your strengths are. And then you'll be in a stronger position to build a product that really connects to people.