Formula vs Breastmilk

Hey guys FTM here 🙋🏽‍♀️. I need some advice. My baby girl is 3 weeks old, she’ll be 4 weeks on Sunday (almost 1 month I can’t believe it 😁). She hasn’t been drinking from my boob so I have been exclusively pumping (That has been so much work). She’s been gassy for about 2 weeks now. I’ve tried gripe water and fridababy windi (they only help a little bit). We started supplementing with Enfamil Gentlease and it was helping a bit with her gas. However, I found a haakaa nipple on amazon that allowed me to “breastfeed” so all day yesterday all I fed her was breastmilk and last night she squirmed all night due to gas pains. I’m wondering if I should stop giving her breastmilk and exclusively formula feed since she’s less gassy when on formula but I’m a mom that believes breast is best. I’m teary eyed rn at the thought of not giving her breast milk😢. CI’m so torn ! Somewhere in the back of my mind there’s a little voice telling me I’m a bad mom if I stop giving her breast milk but there’s also another saying that’ll it will be best just give her formula since it makes her feel better 🤦🏽‍♀️

Btw, i can’t think of anything in my diet that would cause this. I looked up goods to avoid while breastfeeding and I’ve been avoiding them.