Hello and welcome to the forum. Sometimes it is good to share your problems with others in the same situation, hopefully you will feel less isolated knowing there are lots of people willing to help you through the initial stages of coming to terms with your conditions. Everyone goes through the fear, disbelief and anxiety of being diagnosed with Diabetes and it's only natural that you are going to feel confused, useless and unable to cope to begin with it is a lot to take on board, but it will get easier, it just takes time to get into a routine.
Have a chat to some of the members on the teens forum and share your feelings with them. There are quite a few people on here in your age group who will be only too glad to share their experiences with you too. Learn as much as your can and ask questions. You have made a good start in joining the forum, everyone on here is very friendly and supportive.
Take care
Marilyn