For those who exclusively formula fed?

Did your baby turn out ok health wise? Also if you were formula fed as a baby, how are things now? Everyone says that formula doesn’t give the proper nutrients for baby to develop a robust immune system. My baby is being exclusively formula fed due to me having low supply and she won’t take my nipple! Pumping is not working for me either as I’m 8 days PP and I every time I pump for 15 min nothing comes out plus it’s very painful even in the lowest setting. For those reasons we’re giving her formula, she’s been putting on weight and pediatrician says she’s healthy. But I still worry about her immune system tho 😕.