I remember when I was in college, people told me I couldn't play in the NBA. There's always somebody saying you can't do it, and those people have to be ignored.
Menuhin was playing Bach on a fantastic spiritual level when he was a teenager.
Growing up I played in garage bands and cover bands with my older brother, and he got us a gig opening up for some hippie jam band. I was 15. I felt like such an adult!