Want help about my EC!!!

<p>Hi, everyone. I am an international student from China.
I have EC but few, and I do not know whether this one is a strong one. Can you have a look and give some advice or simply answer the questions below?
Well, I have been a boarder since primary school because my parents are so busy. I think it is different from the boarder in US as we are not allowed to leave school during weekdays.(Actually I do not know what it is like in US) So I do not have chance to do off-campus community service. But I serve as the only dormitory assistant supervisor in my school since middle school. (like grade 7) Almost all my spare time is spent in this as we have about 500 students live on campus and I have to solve the problem they meet. But I have got no paying, no medal or anything else. I also have some other ECs which look good taking shorter time. But this one is the most I devote to and I would like to include it in my EC but have some confusion.
1. Do you consider it strong or impressive? I mean I have spent long time and made great effort.
2. Can I use it as volunteer work or community service</p>

<p>I'm sure if you explain your situation in your application essays you will be fine. Your ECs actually seem quite impressive (helping manage kids is no easy feat, I had a summer job managing 100 kids and it was a pain!)</p>

<p>Please give me more help!</p>