The way I see breastfeeding is that you can decide to make it work and it will work. But you really have to trust your body and our mothering for that to happen. Our bodies, as women, were made to feed our children. It is rare in the mammal world for the mama not to be able to feed her babies (although it does happen). Your body will be able to make enough milk if you do what the mamas here are saying.
Demand determines your milk supply. The more milk removed and more suckling that occurs=more milk made. Yes, her suckling will help your supply. Giving sucking supplements and milk supplement will decrease your supply, regardless of galactagogues. Baby has to be at the breast as much as possible. Take a babymoon. Get into bed with your baby for a weekend and let her nurse as much as she wants/will. All day and night. Let everyone else do the rest--cooking, cleaning, etc, if at all possible.
If you WANT to breastfeed, you can do it. But your heart has to be in it 100%. You can not allow yourself to accept defeat.
If its not that important to you, you have to decide that for yourself. We can not make that decision for you. Most of the mothers here believe that its breastfeed or bust . Just had to say that. Your child will be okay if you feed formula. Lots of us have survived it.