<human>: This is probably gonna come off as quite amusing to some of you, but thats fine. Thank god for the anonymity of the internet! 

So, this question concerns my new girlfriend. We've recently started having sex, and shes into it, but she keeps mentioning finding out what my boundaries are, and pushing them. Now I'm a pretty open minded guy, and I'll try most anything once. I'd like to think I'm fairly adventurous even, but there is one thing she mentions that bothers me. She likes rough sex, which I'm all for occasionally, but she likes some pain, some hitting, hair pulling, choking, and the real big one for me, name calling. 

This is just... well, it's outside my comfort zone. I don't know how to be a "mean" guy in bed. I'm usually very quiet, and if I try to be verbal, i.e. name call or talk dirty, I just feel ridiculously embarassed and quickly lose all steam. How the hell can I try to feel more into that sort of thing? It's just not me, but I really want to do what I can for my woman. Sex with my previous partners has always been fulfilling because I knew exactly how to please and that's honestly 80% of my enjoyment. I like the power you feel when you can get someone off, it's exhilarating.

Can you give me the gist of the text in a nutshell?
<bot>: My girl likes rough sex and dirty talk in bed, I'm shy about it. How can I improve w/o feeling ridiculous?