I had trouble with maths (especially long division) until my junior year of high school, when it suddenly all made perfect sense. Trig and calc weren't my easiest classes, but I didn't get failing grades in them, either. Tutoring remedial maths at uni honed my skills, and helped me earn my BSEE, which led to the MSEE and my current job.
Maybe some people's maths skills don't "blossom" until much later than others.
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