Where did you top out in math classes?
LPTS: For me the brick wall was social, not related to the math, and I hit it in geometry class in 10th grade.  Our teacher was an idiot, and had trouble solving the more difficult proofs at the end of the homework.  Day after day I would go up to the board and write down the solution to the problem he couldn't solve.  Then, I would get an F for not turning in my homework, which I rightly considered to be a waste of my time, and the people who copied down my answers would get an A's.  That was when I decided I had enough formal mathematical education.  I taught myself the math to do AP chemistry in high school and tested out of pre calculus in 2000 in college.  I am currently teaching myself calculus from Michael Spivak's Calculus.  You couldn't get me back in a math class, but I love learning math.