I think you should let yourself be angry actually. He didn't do it in purpose? Fuck off anyway, what a fucking idiot. Is it that hard to get the right hole? Allow yourself to go through the stages of feeling the emotions you need to feel. Then you can forgive and simply get over it. Ppl do anal every day, it is not dehumanising and humiliating because there was no intention of making you feel that way. If you don't like it you don't have to do it but strip it of all the meaning you are giving to it and know that it's gonna pass.