Don't forget that college is a business, and they have other considerations besides whether or not you deserve to get in. If this does not work out, don't let it slow you down! Get into some other school and keep going.
I decided to come to Singapore to study Diploma in Information and Communication course in Singapore Polytechnic since my dream is to become professional in IT. Computing was not famous subject in Myanmar and there was not much learning center to study there. Despite disapproval from all my relatives and friends, my family supported me to be able to study in Singapore. I had not disappointed them with my studies since I received a few awards for my outstanding academic performance. I graduated with Diploma in Merit with 3.84 GPA which I had been proud of till before receiving decline notification from admission office yesterday.
Here, is this 1,000 characters? I see that it is about 600 characters. it is impressive, and you should add a little more to it... make it succinct and powerful. Don't ask "why" but instead plead a case about the importance of what you are trying to do. Tell them about your vision for the next 5 years and what you hope to accomplish to help people in your field or in your country. Tell them about a mission you are on, and I bet they will accept you.