Re: About to give up breastfeeding !
I think that your real problem here is your self-confidence. You're looking at your pump output and feeling inadequate when you really shouldn't be. Your output is fine, and you should't really expect to see more than a couple oz when you pump. I know you have a friend who gets more milk- but that doesn't mean you're not making enough. Your friend could just be one of the many moms who starts out with oversupply!
Put the bottles and the formula away. I don't think you need them.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"