Breastfeeding and Pumping

So I just recently had my second baby. Taking what I learned from the first time around I am breast feeding the most during the day and then I am giving her bottles of formula to have a chance to sleep. Now I kept a log one day and I found that I was breast feeding her 8 +times a day but I am still giving her a bottle or 2 during the day. It’s getting so it feels like I don’t have time to pump. It just makes me feel like I am stuck in one place for a long time and I can’t do anything else. Can some experienced mamas please help me? I need to know what I am doing wrong so I can build up a good milk supply for her. I have seen women who fill whole freezers so I am feeling like it’s me.