I think my brain is weird

So i need to start weaning my daughter onto formula. But idk for some reason is feel weird doing it. She have lived off my breast milk for 5 months almost 6 and idk i feel weird about giving her formula.

Maybe its mummy guit because i know if it wasn't for my breast surgery she could just keep going but unfortunately due to that i need to be dried up by june.

I guess im feeling gulity giving her "second best" when im more then capable giving her "the best".

Anyone els feel that way when you weaned.