Nope not to young. If anything you would have time on your side to choose your path in aviation. Remember that there is a world outside airline. Buy the books and start studying.
Its all about attitute and your level of maturity when it comes to approaching the training/schooling. Also be aware that you will have to stay away from your buddies when they start smoking dope, doing drugs and drink-driving etc.. basically anything thats fun with mates should really be considered before doing to avoid career conflicts.
Any stuff related to that on your record will be held against you when it comes to an interview.