Hi LovesBlue-
I am proud that you have a job and take care of your Mom when your Dad verbally abuses her. Unfortunately, he is a bully - and the thing that bully's feed off is your hurt reaction. Remember, what comes out of someone else's mouth does NOT define you as a person - it defines them as a bully/tormentor.
Keep your head up and be strong. There are many of us out there that have had to cut off relationships with family because of their toxic behavior.
You have one life kid - live it the way you want to - be proud, respectful and love yourself unconditionally. What other's think (including blood relatives) does not count.
I hope this is helpful.