Dear God, I was pretty decent at everything, at least in high school. I'm pretty good at math, even though I hate it abysmally. I managed to make it through Advanced Calculus pretty well.
However, my strength has always been in History and Literature. I partially blame my parents for those though lol. My mother fed me a steady diet of Lord of the Rings ever since I started reading at age 3, and my dad has been teaching World History for ages. I took college level courses in both subjects during high school.
Oh, and I figured out in high school that I'm pretty amazing with languages! I took Spanish for nearly 9 years, from when I was 5 until I was 14. Now I'm on my 6th year of studying Mandarin in college.