Teenage children are at times very difficult to handle, here going strict with them or imposing your wish on them would only make matters worst, as at this point they would not understand what is good or bad, for them what they want is always right.
Teenagers needs to be handled with extreme patience as they are more obedient when handled with love and care. And here you too have to understand that children have different ways to enjoy themselves may be your son is more keen on music than sports, there is nothing wrong in this, you should try to respect his interest and who knows he can do exclusively well in his area of interest.
Give him room to grow, instead of controlling his life try to understand him and then things will be clearer to you as well.
Encourage him positively to grow his friends circle and let him know the importance of working in a group and as to why he should interact with everybody.
Trust us if you give him your proper time and attention you would feel you were worried about your son of no reason.
Cheers!!! And God Bless!!!