How's your stance? Are you orthodox (right hand) or southpaw (left)? You basically want to stand at an angle to your opponent. So if your powerhand is your right, then you would have your left leg to the front and your body facing the right. This is the usual setup so that your left hand is closest to your opponent and your right hand is cocked back. Opposite for southpaw. Some people prefer everything reversed but try what you feel is most comfortable. Always keep moving, as in everything. Move your head, you hands, and your feet. Breathe. Adrenaline will take over you but you need to have something left once it passes (if you two get to that point).
Why are you getting called out? I'm more of a peacekeeper lol, so is there anyway you two can settle this differently?