If you want to go, then go. If she decides not to go, that's her issue... not yours.
Well if you don;t know how to act when liquor is involved, I wouldn't recommend you go. You mother is clearly embarrassed by your behaviors.
You may be "entitled" to do it... but, it only proves how immature you are.
A mature individual does not believe that getting "wasted" is cool. Either you are immature or you are an untreated addict. There is no other option. At your age, why are you still a student?