Very good time for that build. Seems like you're solidly built already for a 16 year old and to run a 11:12 is very impressive. If you keep running you'll improve over time and eventually crack 11 minutes.
Some lad I know broke the record for his age group in the region the year before last when he ran it in 10mins 30secs (not approximate).
The fastest I've ever done it is 12.23.