What do you think about me using a college fund my grandmother set aside for me for something other than college?
Why do you want to do that?
I am bored with college and I want to use it on a summer vacation overseas
You should try to be honest and use the money for it's intended purpose. It will be difficult for other people to trust you if you are dishonest in this situation.
Life is ever changing, why can't I change my plans.
It would be better to have a discussion with your grandmother if you truly want to use the money for a different purpose. This seems like a more honest approach.