I think you need to tell your doctor, as littlebit667 said you may have postpartum depression but only a doctor can diagnose that and help you best. Maybe start telling those around you how it really is for you, they need to know life is hard for you at the moment and they will understand it doesn't mean you are a bad mom or anything but you do need to get some help. You deserve to be happy.
Not a doctor, but possible to have postpartum depression. I would talk to your OB or GYN.