Theres a technique i used to use in that situation, you almost always know when a fight will occur so for about 10 seconds before panic like mad, let all your fears get in and take control for a brief moment, then, after that 10 seconds think to yourself thats it, iv'e worried about it and now its time to take action, for me it works, im controlled, confident and the fears basically gone, don't know if it would work for anyone else but it did me...
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'...You cannot shake hands with a clenched fist...'

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