Feeling guilty about stopping breastfeeding...

My son is a month old now and I'm not enjoying breastfeeding, he has a good latch but it hurts still initially every single time. I also have ginormous boobs, like E cups that are just overwhelming and make me really self conscious, I used to be a C cup. I've been thinking about switching to formula but I feel so guilty about depriving him of breast milk :( I don't know what to do ...anyone have advice?