My advice is never give up. You have a deep introspection on your life which is a double edged sword. On one hand it's very important to learn from your past and your mistakes. On the other hand you need to believe in yourself to succeed. Don't short change your skills or ability.

I think the thing with the most value you can build in your life is a company. One off websites can be very successful, but it's rare. You'll have higher success building a business that solves some problem for a big audience.

Come back when you've failed ten times. I'm sure even then you won't be asking that question.