I took calculus very recently and I couldn't grasp any of the concepts like the other kids. All of them were a little older than me, around 18. The teacher would explain something and I just couldn't catch on. I want to say that maybe I'm just not a big math person but this is my stronghold in school. My guess was that since I'm a really late bloomer is it possible that my brain is just not prepared for such complicated mathematical problems or are our brains fully developed when we hit puberty?