I always disliked math in school, struggled with it more than other subjects, on the SAT it was my worst area. I assumed I was bad at it.
Looking back I wonder if I actually had a chance of doing better but was set up for failure by a lack of good teachers. I always thought I had a better inherent ability for reading/writing subjects - English was always my best - but thinking about it I got a ton of early help from my parents with that stuff, reading to me a lot and encouraging me to read and write from an early age, and nothing from them in math. How much of math ability should shine through regardless of the quality of teaching? Nature versus nurture basically.