I am a 14 year old boy. If I do something wrong, my father hits me. I have a lot of respect for my father. However, I want him to stop it. How can I tell him?

Firstly we would like to tell you something:
It is forbidden to hit children in Germany.
The law states:
Children have a right to be brought up without violence.
Parents may not intentionally injure their children.
They may not physically injure them.
And they may not injure them psychologically.
Hitting causes injury to the body and the psyche.

That is your right as the child of your parents.
This law exists to ensure children can grow up healthily.
You may say this.

If you are unable to talk to your father by yourself there are also help centres.
In Munich you can find a help centre close to your home: http://www.muenchen.de/dienstleistungsfinder/muenchen/1053/
Children and young people across Germany can call the Nummer gegen Kummer: 116111
You can call this number for free from your mobile phone.
There are people there from 2 pm until 8 pm who you can talk to.