Trust me. What you may think you want to do now you may not necessarily want to do once you get to college. In 12th grade, I was dead set on doing a PhD in psychology. Then I switched to financial engineering, then economics, and finally statistics. Your courses really shape what you end up being interested in, and high school-level math is quite different than college-level, where you will have to think abstractly and do lots of proofs. I think nowadays more than 2/3 of students switch their majors at least once throughout their college career.
Having said that, you said you "got 41 right wrong", which I assume you mean your raw score was 41. This is pretty impressive for someone your age as many people who pursue math PhDs will score at this level even after taking advanced level courses. However, if you want to get into a top PhD program in math (not statistics, not applied math, etc.), you will probably need to score at least close to the 90th percentile, and I would imagine one would need to score higher (others on this forum can provide you with better information on that).