Help me please!!!!!

Hi, I have to write a motivation letter for an English course. I'd like to write a good letter, could you correct this letter please? You can add information or give me some advice...Thanks!

Dear Teacher,
I’m writing to participate at the English course, in which I’m very interested. My name is Silvia, I am a student at High school and I’m sixteen years old. When I was at middle school I attended a English course every year, because I love languages, and these courses motivate me. I was very delighted to find the opportunity to improve my English skills. I have decided to apply for this course because I am sure it would enrich my future studies and help me in my prospective career. I want to talk fluency in English for many reasons. Firstly, I would like to attend a university where all the courses are taught in English. I have also great expectations from studying abroad. I think that a larger view on the world could give the chance to be more productive on study, on work and, generally, in my whole life. So I would be very grateful if you consider my application and let me participate in this course, which would mark my future professional and personal development. Having in mind my good study record and high level of motivation to participate in this language course I believe to be a good candidate for this course. I am looking forward to your response. Thank you very much in advanced for your consideration.
Yours faithfully,