Can I fix this??? ( Toenails )

So I’ve always been insecure about my feet.. I’ve only been out with sandals maybe 3 times my entire life and open toed heels maybe 4 times. I never took care of them bc they were always hidden in socks. So when I became a teen I started “ taking care of them “ and I didn’t know what I was doing. So I fucked them up bad . 😖 so I would take the stuff that was in between my toe and skin and just dig up there ( white stuff would come out ) .. now I know bc of this I have ingrown and my toe cracked so bad the other day doing this I have no idea what to do. Does anyone know any way to turn these ugly toes back to them just growing straight, white, & pretty? Or have any suggestions on what to do? 😞 i just want them to look nice. ( I just cut them right now bc the nail had cracked ) I don’t even think they’re that ugly now but they’re all yellow and cracked 🥺 someone help?