Mate,
How's the screen looking? All that really matters is that the screen has no scratches still. Yeah those tiny scratches might annoy you a little bit, but its a mobile phone. Get over it, I can't wait for the day you get a car, leave it in a car park and come back to see a ding from someone's door. That is really annoying. Tiny scratches on a phone that is functioning properly are nothing.
I had keys since I was 11 too, I'm 23 now (but will I live to see 24, the way things are goin' I dunno) - woah went all Coolio there. Anyway, I'm 23 now and my iPhone's back is scratched to hell, but its because I sometimes put it in a pocket with coins or keys in it, I dropped it once as well but the screen doesn't have a single blemish and all that matters is that you can use the phone.
Don't go ranting about tiny scratches and a guy who can do NOTHING AT ALL to get rid of your scratches. Go blow off some steam, play some soccer, hack the ankles away from an opponent, take a volley and aim for the goalie's face.