My son turned 16 last week and since he has done nothing but cause stress, worry and acting as though he is a fully grown man. He has not come home at night, I have had to ring round his friends to find out where he is...nearly had to ring the police as I was so worried. Today my other son came home and told me he had seen him with a local drug dealer and his friend had bought some cannabis.I knew where they would be so I walked there and my son run off, he still hasn't come home. He was dead set on joining the army and has started the process already due to start training in the summer, he has a girlfriend who he seems to be absolutely obsessed with. He has also started self harming and will cut his arms and makes sure I see it. I have said I will take him doctors and try anything i can to get help but he refuses to go. He will spend hours on his phone, treats my house like a hotel would rather be out with his friends or girlfriend than come home to eat. He can be really nasty to his siblings,, and goes on like he's the worlds strongest man. He has his gcse's soon and I am so worried this will tip him over the edge more and he will ruin his dream of joining the army. I honestly do not know what to do anymore any advice would be greatly appreciated.