I'm sure you're doing well right now, but are you sure it's a good decision to rely your entire life on a judgment made by your 9 year old self? I mean, what have we learned by when we're 9 year old? Maybe you learned some arithmetics and concluded that you've mastered the entire field of mathematics? Again, I'm not saying you made a mistake in your life, it may have worked out for you but it may not work for 99% of the population. Maybe you were lucky.