Don't worry if you aren't as good as the guys who started at 15. I started at 8 and there are guys who are doing stuff that is blowing my mind. There is always someone smarter than you (unless you're Knuth).

Focus on what you want to do - not what others are doing. Be the best at what you are good at not what others are good at. Becoming an evangelist means that you will need to focus on your communication skills - getting the job might come down to quite a bit of social networking.