He's educating you so you'll be an excellent slave, you should think of that, even if you are already willing to be a slave, his job is to test you, see if you really have a vocation to be what he's expecting you to be, this is just the start of what will come, so both of you should know if you are comfortable with each other. There's got to be trust in both sides, you should trust him that altough he's being mean, he will stop when you can go no further. And he should trust you that you are the submissive slave he's looking for. I encourage you to use safe words and use follow'em. Have a kinky week end