Depression is REAL and unfortunately poorly-recognized especially among family. Often they think we can toughen up, and deal, and our failings are due to poor character and choices. You don't want condescension or pity, you want support and help. I would recommend professional diagnosis before breaking this to your family. A doctor's word will carry more than yours in a society that lumps us all into one equal mental category. Your family may not understand without this confirmation.