If there's something that doesn't sound like a native English speaker, where is it? For example, I feel that the comma or something might come between "a 16 year old" and "10th grader". And I feel that the part "I didn't know much about you" is not proper here. Don't you?
"Hello. I'm excited to think that you are now reading this letter. I'm a 16 year old 10th grader living in A which is very close to B. I saw "C". You looked really cute just like a doll with your porcelain skin, curled hair and the wonderful dress. To tell you the truth, I didn't know much about you (I'm sorry!). But I became a big fan of yours ever since I saw this movie. I was surprised when you suddenly kissed D at the scene where you first meet him, but I like that scene very much.
I asked my friend's older sister about the movies you have made so far and I plan to see them. I have seen "E" and I was surprised to see you as an entirely different person from "C". I also saw "F" on video. You looked really cute in braids. But your hair was dark. Which is your true hair color, blonde or dark?
I'm planning to see all your movies from now so please keep on making many movies. I will write again so please write me back. Please take care and I wish you the best.
Yours Truly, A"
Thank you for your time.
"Hello. I'm excited to think that you are now reading this letter. I'm a 16 year old 10th grader living in A which is very close to B. I saw "C". You looked really cute just like a doll with your porcelain skin, curled hair and the wonderful dress. To tell you the truth, I didn't know much about you (I'm sorry!). But I became a big fan of yours ever since I saw this movie. I was surprised when you suddenly kissed D at the scene where you first meet him, but I like that scene very much.
I asked my friend's older sister about the movies you have made so far and I plan to see them. I have seen "E" and I was surprised to see you as an entirely different person from "C". I also saw "F" on video. You looked really cute in braids. But your hair was dark. Which is your true hair color, blonde or dark?
I'm planning to see all your movies from now so please keep on making many movies. I will write again so please write me back. Please take care and I wish you the best.
Yours Truly, A"
Thank you for your time.