How do you beat a big person in a fight?

Since strength and size is all that matters in a fight shouldn't small people have alot to worry about? Speed and skill is not important as power and strength and size is I hear alot of people saying this. So the question is how do you beat a big person? Because thats my biggest fear I train in MMA and I lack... show more Since strength and size is all that matters in a fight shouldn't small people have alot to worry about? Speed and skill is not important as power and strength and size is I hear alot of people saying this. So the question is how do you beat a big person? Because thats my biggest fear I train in MMA and I lack the confidence to fight someone bigger because It seems impossible to beat them and I want to be able to protect myself from them. People say all the time that power,size,strength is the only thing that matters alot of time so how do you beat them if they are invincible? People say that speed and skill dissent matter simply because we'll apparently in a fight all it takes if for one well placed punch to end it all which I believe to a extent and bigger people are the exception to this so how do you beat them whats the trick!? How!? Also people like to say since size don't matter why are there weight classes?
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