ppd? or bad mom

just cuz i feel lik this is a safe place to share very recently i started to think i might have ppd my daughter is 5month and it started about a month ago...ok sp first off i get no help at all since the day she was born its been all me her dads in the picture just very inattentive.. so i feel very overwhelmed like somedays i just wana set her down and go cry..when shes fussy i wish i could just put her down and let her cry it out (i dont i try and comfort her), i get soo excited when its her nap time cuz i kno ima get a small break 15-20mins..when she does start crying i feel anxious lik i dont know what to do,i feel lik i dont talk to her as much as i should.. i love her but all this makes me feel guilty lik ima bad mom and lik im a failure.. im too scared to talk to about this with my S/O because hes unsupportive and i kno he will just make it worse and i dont see a doctor for myself only while i was pregnant and the postpartum check but i was fine then idk what to do could i have PPD or am i just a horrible person