When I was in middle school, I excelled in my first attempts to learn French. I was a class leader, constantly impressing my teacher and, in fact, often being called upon to demonstrate lessons for the rest of the class. My teacher was also a high school French teacher, but I found out she was the advanced teacher and that I would have to take my first year of French at the high school level with someone else. For some dumb reason, I didn't pursue foreign language again until my junior year of high school, at which point I noticed French was much harder for me to wrap my head around. In just three or four years, my brain had apparently calcified around language to the point where foreign languages went from fun and easy to difficult and frustrating.
Long story short, I believe in Chomsky's theories on innate language development due to my own personal experience!