PPD and anxiety

I just started medicine for my PPD but sometimes I feel like I can’t be a mom. I get so overwhelmed and tired of having to take care of this precious human when I don’t even want to take care of myself. I try my best to always be smiling and play with her but some days at the end of the day I just want to be alone. Am I capable of being the best mom this baby deserve? Am I a bad mom for feeling like this some days?