I feel like a failure

I tried breastfeeding and it hurt so bad and I was so tired that I actually let a nurse talk me into feeding her a bottle when she was a day old cause she led me to believe my baby was starving. I found out later from her cues and all that she wasn't hungry and I was actually producing more than she could eat. . I let her have a bottle in the hospital before we came home and now she won't take the boob and my supply is pretty much gone (considering she is already 4 months old) and I feel like im not giving her all I can. . this may be the wrong group so I'm sorry if it is. I just had to get that out.