I'm sure this is postpartum depression but oh my god I can't stand my boyfriends daughter .. She's 8…

I'm sure this is postpartum depression but oh my god I can't stand my boyfriends daughter .. She's 8 years old and threw a fit because we had to get stuff for my on month old and she wasn't getting anything . Then she tried to say we love the baby more than her and what not . Like you know what , yes I do love my daughter more than you because she's mine , your not . I didn't even wanna end up with you dad in the first place but I found out I was pregnant ...