Masturbation has caused me to have low testosterone

Hello there everybody,  

I'm finally starting to admit that have masturbation problems. I am 17 and a half and have been doing it for about 3 and a half years now, at least once a day, maybe even two or three times a day at some points. I tried to stop, but I only lasted a week before masturbating again. Now I have been noticing I am starting to have lower back problems, is this the cause? What happens when you have back problems? I'm very worried also that masturbation has caused me to have low testosterone, The only other thing I have smoked pot a few times(10), but my testicles were small before I even started and then stopped. I am in weight training, about 130 lbs, I know I am getting stronger, but my muscles aren't getting to much bigger. I have a somewhat deep voice, but not fully developed yet.All my friends have beards, hair on their chest ,and I have a a few hairs growing out of my chin and my mustache grows really slow.  Has over masturbation masturbation caused this?Am I going to have to take testosterone shots. I have to admit that I don't have a very good diet. I eat mostly meat, and not to many vegetables. I would say 80% of my diet is meat protein. Should I start to eat more fruits and veggies, will it get better? Also I have noticed that my testes are still small, about an inch big. I am very worried. Is there anything I can do to make my testicles and penis thicket in girth, like not masturbating at all, exercising more, and having a better diet. I was thinking to try it for a month and see if it would make a difference, then see a doctor if I still am the same.What should I do, it's 6 months until I turn 18 and I'm afraid to show my penis to the girls because it's only about 3 inches limpid, but goes over six when erect, but is soft sometimes. I really want to improve, I hope I change this, I'd do anything, even stop if I knew it is this bad for me. Will my testicles grow if i stop masturbating  Because I've heard when you over masturbate causes a spike in epinephrine and really destroys testosterone levels and causes to stunt puberty, what should I do. Sorry for the fragmented questions and miscellaneous questions, but I want to get this fixed before college begins. 

Any help is appreciated!!!!

thanks!!