Mmmm, first-I hate when ppl assume that you don't know that you're fat or that they have somehow miraculously worked out a cure that you haven't thought of. *rolls eyes*

As to the breastfeeding class--my mom is an instructor for those classes. Its easy to get overwhelmed by a baby's needs and some babies have a hard time latching on. My daughter did and I almost gave up on breastfeeding because it really *hurt* my poor nipples (glad I didn't).
The class teaches you what to do if that happens, how to express your milk, how to know if you have an infection, how to wean the baby, ect. It really helped me. So no, don't think it was about you being stupid--just trying to encourage breast feeding. Like lamaze helps women give birth...

P.S. My mom visits new mommies at the hospital and helps them through the first breast feeding.