Why do I feel like I can't care?

I feel I've become a robot. I have lost my live for certain hobbies. Deep down I live them but I don't feel it. Ad same for friends and family. I'm on atenolol drug at the moment. I'm stressed. Very introverted which us ruining my life. I'm very talented at a certain hobby and with a world class teacher but I feel so stressed with it. I'm worried I won't make friends in college. I do feel just rarely. I hardly cry, never really did, but I do still cry. I don't make adrenalin because if the drug I'm on. I want to get better. I don't feel anything anymore and I'm losing interest in life really. Don't take the wring way. I'm not suicidal. Sorry for dodgy typing. On iPod. Please help. I'm sixteen female. Can't seek medical advice yet . Please help