An additional thought........do you have anyone close to you that you could talk to........a relative......someone you can trust?
Are you a member of a church of any kind, where there is someone that you could feel safe with to talk?

Your father is out of line in slapping you. It is called simply -abuse! And in most states, it is against the law.

Now asking you to get off of the telephone is one thing........but slapping you around is a whole different matter. Is this the way your dad usually treats you?