postpartum depression.

It's been a week since my beautiful baby girl was born & even tho I love her with all of me & wouldn't want it any other way, I'm just not happy. Ive been feeling soo overwhelmed & alone. Like I just can't do anything right... My boyfriend works 6 out of 7 days a week & I just feel like I'm failing & failing my daughter because I'm doing it all alone. I want to be happy but I just can't seem to shake this feeling. 
Update - I've scheduled an appointment with a therapist to talk about things. I suffered from depression & anxiety before & during pregnancy so I guess this makes sense. A lot of my "friends" changed on me when I became pregnant so I'm just feeling alone because I really don't have anyone to talk to. I don't have the closest relationship with my parents either.. basically the only person I have is my boyfriend & I feel like a burden on him because he's already working so much for us. I know you guys can relate to me so I used this as an outlet to vent & it helped. Thank you all so much for the comments & advice ❤ I really appreciate it!