Any Differences?

Don't say: I musn't dent this car; say: I will drive safely..
Don't say: I don't want to forget my hand phone; say: I want to remember my hand phone..
Don't say: I am tired; say: I am not feeling well..
Don't say: I won't be late next time; say:I will be punctual..
Don't say: I don't hate you; say: I love you..

Don't say : Don't say; Say: Shut up.. @#$*