As everybody else has said, you are 17 and probably have the best part of a decade before you've reached your peak. That also includes learning about conditions, tactics, reading wickets, reading batsman etc. All these things will help you to skipper in later years.
Being a skipper is 80% admin and 20% on the pitch. It's also easier the higher up the food chain you are ie. 1st skipper as opposed to 4th's skipper. At 17 you don't want to be chasing players on a friday evening when you should be enjoying yourself? Says more about the state of the club if you ask me.