Each breastfeeding journey is unique. I had a completely different experience with all 3 of my boys. With my oldest I was an over producer, with my middle child I could produce just enough, and with my youngest I am not exactly an over producers, but I have a good stash in the freezer.
I know it is hard, but do not stress yourself out on how much you produce and dont blame yourself if your are not producing as much as you would like.