Lots of good advice here. I think it boils down to:
Execute and Iterate.
At 20 you lack experience, the 10,000 hours, to be really good. Don't dream of things, do them -- even if they 'fail' in the traditional sense. Learn from the experience and try again.
Execute and Iterate.
At 20 you lack experience, the 10,000 hours, to be really good. Don't dream of things, do them -- even if they 'fail' in the traditional sense. Learn from the experience and try again.