You are a Bad Mum for not breastfeeding?!

My MIL has just called me a bad mother because I am not breastfeeding my child. I have been expressing/pumping my breast milk sometimes and giving my child formula most of the times. I have been told that it’s only bad and selfish mothers that do this. Apparently, skin to skin contact with your baby will make your baby become closer to you and love you more. Is this how people feel about mums that choose not to breastfeed? Wow!