I'm afraid of being fired
Why do you think you're going to get fired?
I am afraid that my boss will be angry with me and that I would not get any more work to do.
We all feel as though we aren't enough sometimes, but having an unsubstantiated fear about your boss not liking you and firing you is bad. Question your fears and confront your insecurity within yourself.
Don't worry I'm planning to quit in a few months
Well if you are going to quit anyway then I guess there's no problems then.