Sorry to disagree with the other chaps, but I strongly think you should change yours, the other site looks much nicer, your site although perhaps is adequate it is all one colour, the words do not stand out from the background, and it looks boring, as their is no colour.
Visually the other one looks much more appealing. I would strongly advise you to go with your own instincts. However, the blue colour is one of the most soothing and popular colours people like to use, a bit of contrast would look nice thought with a splash of colour, especially if it is a teen site, where everybody has got a bit of energy and life.
Just my own thoughts. Goodluck with your project whatever you decide.
p.s. Actually my opinion is that in fact your site is actually *nicer*, but the biggest point is that it needs some colour. So in fact I would agree with the comments of two others and in fact take the colour aspect of the other site and place it with your superior, sharp clean and organized look and you will have a really improved look
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