Breastfeeding

So my daughter is 4 1/2 months. I only exclusively breastfed for a month and have been supplementing since then. But lately my supply dropped majorly and I felt like my body was telling me it had enough. Every teensy bottle I pump leaves me more and more depressed. I feel like the stress is just really getting to me. Today is my first day with no feeding and pumping and I’ve just been crying all day. I feel like a failure and like I’m not ready but the supply just isnt there.