Am I being a difficult person to my family?

Hey, you're normal and it's normal to be grossed out by his repulsive acts. Your brother isn't bothered by the same because he just doesn't notices, he is probably just plain oblivious. You love your dad but love has nothing to do with what you're feeling. Save up, move out but in the meantime you have to eat to survive, survive to move out, make your own meals, learn to cook, you'll need to practice for later anyway. Good luck and remember, you are the NORMAL one.