How do I put myself first without feeling guilty about stopping breastfeeding?

I originally planned to feed my baby with formula, but my husband and everyone else kept saying that breast milk is better for the baby, especially since he’s still so young. So, I gave in and decided to breastfeed. But now, I’m starting to feel like I want to stop. I’m constantly emptying my breasts, and it feels like breastfeeding takes up all my time. I know I could get the best formula for her, but I just feel like no one is considering MY feelings. It’s all about what’s best for the baby, and I get that, but after giving birth, it feels like everyone’s focus is only on her needs.