All teenagers have problems learning to deal with life in different ways. It's a part of growing up... BUT there's a BIG difference between misbehaving or maybe even being plain lazy compared to have a severe depression and having thoughts about ending one's life.

A child who's been struggling with depression since the age of 9 needs to be seen as more than just 'a teenager coping with growing up'. When you're 15 years old you still IMO need to be guided by your parents. I very much believe that you are a very important part of your son's life. No one can ever take your place as his loving caring mother. You DO make a difference!