common app essay based on EC(s)?

<p>Well, I'm struggling on my essay's topic. I'm an international.
I really love linguistics, though I'm extremely sure I did them simply because I liked them very much and linguistics will NOT be my major. These may sound unrealistic, but I established my school's linguistics club (&teach there) , organized my school's attendence for my country's National Linguistics Olympiad, studied certain parts of linguistics for 5 yrs, learned 4 languages and created 3, all by myself. Well, people I know 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(4/10, almost a half), so won't writing things about linguistics 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"...-_-?</p>

<h1>But my mom, her friends and an advisor(only met once though) all strongly recommend that I write that, so I really want to know if writing such things is advisable.</h1>

<p>I've posted one in a wrong forum so I just "move" this part here. I really need an answer.</p>

<p>If the essay shows an important part of who you are that is not clear from the transcript, it could be really good. Focus on showing who you are though, not on what you’ve done.</p>