Many of us get a wake up call and you've obviously had yours, and it can be very scary and distressing. Look through the forum and you'll find a lot of diabetic teenagers seem go through a period of rebellion and self neglect, so you're not alone! If you treat yourself badly then you may cause yourself some damage, but if you continue to look after yourself properly now, then there's absolutely no reason why you shouldn't live a long and healthy life. Go to Amazon and get yourself a copy of
Dr Bernstein's book for a bit of inspiration and reassurance from a man who suffered some bad complications early in life (through no fault of his own) and managed to turn things around completely and live to a ripe old age.
Good luck and keep up your good work!
Robbity