I'm not going to give my friend any of the candy I've been saving.
Why don't you want to share the candy?
There's plenty of candy to go around
It's fine that you don't want to share something that's yours, just be sure to be polite when you decline. People can be upset when you refuse to share, especially if you refuse in an arrogant manner.
Whatever, I'm not giving any of them to her.
It's fine that you don't want to share. However, be sure to express them in a manner that won't lead to conflict.