Is it safe for a teenage boy to become a vegetarian?

I'm 17, and I'm considering becoming a vegetarian for a few reasons. I've heard from friends that when you get all the processed meat out of your system, you feel great and healthy. Also,it is VERY expensive to get all organic food, so this seems like the next best alternative. I'm getting sick of the modern "American" lifestyle, and I would be a hypocrite if I didn't make some changes to myself. On top of it all, I watched some videos online about the meat industry, and I was really bothered by the unsafe additives, and the way they treat these animals. I figure that just about any meal could be done in a vegetarian way. My only concern is the safety.Am I too young to make such a change to my diet? Will it make my body weak? Thanks!