Failing as a mother

My 18 days old has started getting exasperated at the boobs. He goes all red and scratches his face. I was able to express 3 Oz from both breasts and be drank fine from the bottle. And for the next feed he was frustrated. That I have to top it up with formula.

I'm so disappointed and feel like a failure, cause I wanted to EBF. I don't know how to regulate my milk supply.

Recently he has started to go calm as soon as he goes to someone else. And fusses when he is with me. I feel he doesn't like me already. Makes me feel even more useless.

I feel so bad all the time as I'm not good enough a mother.

Any suggestions on how to increase my supply and be better