No it's not worthless now! It just means you learn from your mistakes. Heck I ought to be a genious by now by that thought process though. How did you anneal, by putting in a fire pit, wood stove etc? How I do it is by a one brick gas forge, actually a two brick forge, and stand it on it's edge. Anyhow yes you can put it in a vise and twist pound etc to get flat because it is "soft" or pliable now. It's just alot easier to keep it flat from the begining. All is not lost you've just got another bridge to hurdle. No problem. Keep us posted.