Breastfeeding VS Formula

Hey y'all! I had a question for y'all. I have been exclusively breastfeeding for a month on Thursday. I know it's still early to have a routine established, but our days are so crazy. Sometimes she can go the full 3 hours before eating, but other times we barely make it an hour. I was wondering if any moms that formula feed see this same behavior or if their babies eat on a more consistent schedule. Sometimes I feel like I don't have enough milk and that's why she feeds so often and crazy. Thanks!!