I know what you're feeling. I app'd for a couple of things at the beginning of this process that I really shouldn't have. If I had done a little more research I could have saved myself a few INQs. (Why, oh why, did I think I had even a slight chance of approval for a Blue Nile LOC issued by BofA when I had scores in the high 500's / low 600's?)
Don't beat yourself up over it. Live and learn.