Help me? Personal, sexual question.?

[Nikkeah]

My boyfriend and I skype a lot, we're long distance so we have to. We've never actually had sex before, and he wants to watch me c*m over skype. But I don't want to do it because I'm too insecure to let loose and do it, and I kinda get loud and convulse and stuff. I don't want to accidentally squirt or something embarrassing like that. I'm also too insecure to show him some parts of me, and he says he'll accept me any way that I am and that I'm beautiful but I'm still shy and self conscious. So my questions are: 1) do guys like it when girls totally lose their composure while doing sexual things? And 2) what can I do to be more comfortable?