Essay topics?

<p>Well, I'm agonizing on my essay's topic.
I really love linguistics. I know these may sound unrealistic, but I established my school's linguistics club, organized my school's attendence for my country's National Linguistics Olympiad, studied linguistics for 5 yrs(about sounds, language development and dialects), learned 4 languages and created 3, all by myself, and I'm extremely sure I did them only because I liked them and linguistics will not be my major. Well, my family, my acquaintances and I all agree that creating languages is amazing and can stand out and I really only mentioned it with 3 words so I feel there's a lot to write, but the problem is that those other things are all on my ECs, so won't writing it sound repetitive/unwise(though I'm sure I haven't stated my passion, experiences and growth explicitly anywhere)? Plus, the colleges I'm applying almost all have EC supplements like "briefly elaborate on an EC particularly meaningful to you", so I really think I should write things showing my other sides but those can be less "rememberable"...-_-?
Another problem is that I love physics the most and it will be my major perhaps until Ph.D (filled so) but I've received no awards of physics and have done most things by myself. i.e. no student clubs, no accelerated classes and no inventions alike(even no APs), and all my science grades, including physics', are noticeably lower than humanities' (around 90% vs. 99%) because I always made careless mistakes... I really want to try a top college but I fear they may consider me weak/incompetitive in science and unwise to state so. Should I explain it somewhere, try explain/show things like my passion in one of the essays or don't say anything at all?</p>