feeding question?

Everything I read and everyone I talk to says feeding is the way to go. In fact most chat sites Ive been on criticize women pretty harshly that choose not to feed. I know all the benefits and I really wanted to, but unfortunately I only have milk coming in on one side, it is so incredibly painful, I just dont think I can keep it up. Ive managed to last about a week, but this weekend Im thinking about making the switch to formula. This is a very difficult decision and Im very disappointed that I wasnt able to feed longer, so I would appreciate some understanding. I know formula is not a good a my own milk, but will my baby still be able to get enough nutrients?