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As Jey said, you need to have a talk. BDSM requires a lot of communication, probably more than vanilla sex and relationships do. Before you play, tell him what you want to experience, tell him what scares you and what holds you back, and ask him what he want to do, then negotiate what you're willing to receive and what you need to put off until you have more trust and comfort. After you play, tell him what you enjoyed, what you didn't, and what could have been better.
I don't know how much experience your dom has, but if he's new, he may still be developing the confidence he needs to be truly effective. If that's the case, it's very important that he get feedback from you about what you liked and what you didn't, and what you want him to try. This will help him grow more dominant.
Also, something you need in order to surrender is to know that he understands safety, that he's not going to do something that might accidentally injure you. So make sure that he's done some reading on safety issues. The reason I mention this is that you mention that he chokes you. Breath control, although common, is quite risky. The two of you should read Jay Wiseman's thoughts on breath control (just google "Jay Wiseman breath control" and it's the first thing to come up) before you do it again; you need to be aware of the risks it entails.
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