breastmilk to formula

baby is going on 10 weeks old & I've ebf the entire time, except for the first 2 days until my milk came in I had to supplement with formula but that was it. I've been thinking about switching to formula because baby seems like she's still super hungry after she eats & on top of that shes been having AWFUL super smelly gas . I've cut foods out of my diet, I'm already a super picky eater as is. I feel like a failure but I dont know what else to do. there has been a couple of times at like 2 & 3 weeks where I've tried formula because she seemed like she was still super hungry but she HATED the formula. she takes a bottle of breastmilk with no problems, but will not take formula. should I try mixing the formula with breastmilk & wean it that way? if so, how do I do that? I drink plenty of fluids. shes gaining tons of weight. idk I feel like I'm doing something wrong... she refuses a paci. helpppp