friction burns

ok so imma keep this as short as possible, i have a larger chest for my age so im incredibly insecure about it (like i hate them soo much) therefore i wear 2 bras 24/7 i only take them off to shower and that has recently started to cause friction burns in between my chest and i wanna know how i can get rid of/prevent them bcz they’re very painful and annoying

(i hope this makes sense im bad at explaining things)