I'm going to be fired from my job.
Why would you be fired?
It was a miracle that he gave me a job in the first place.
If you know that you haven't been doing a good enough job to keep your position you should do you best to try harder.
I don't have the energy to do this job properly.
It's your responsibility to do the job correctly. Don't be surprised if an employer doesn't value you when you don't do the job you were hired to do diligently.