Goodbye pump, hello formula

After exclusively pumping for six months I’m throwing in the towel. I have hated pumping since the very beginning but I did it for him. I just can’t do it anymore. It has really started to impact my mental health. I have insane guilt over stopping. I feel so selfish but I can’t keep up with what he needs anymore. I’m pumping around the clock and still having to supplement. Does anyone have tips on how to stop pumping? Also, how much formula are you feeding your babies/how many times a day?