Most Helpful Girl
You're right about what toughness should be based on, and the funny thing is is that you said that you come out on top most times. Now if these guys are starting fights because of your size, well first of all that just goes to show that they are insecure and need to make themselves feel superior by calling you out for being smaller or shorter. But just think how stupid they must feel for picking on you and then getting their ass kicked from you, who they clearly picked on for not being as big, tall or even manly than them. Now that must make them feel pretty stupid! Plus, being shorter or smaller has probably taught you to be a better man more than you think because it must have taught you to be humble because you see things from a different perspective and you probably don't act superior like most of the other douches you've described. And you probably have a bigger and better heart because you know first hand what its like to be picked on for appearances and your probably more sensitive to other people's feelings for it. Overall you are probably a better man and person for that matter because of what you've learned from your own experiences due to your appearance. I only say all of this because I know firsthand what its like to be in your position, because I was picked on as a kid, plus I'm also short, but I believe that I'm a kinder, more sensitive, humble, and generous person because I care about others' feelings and I don't ever want to put anyone through what I went through.
P.S. 5'10 is not short, I'm from the U.S. and your height is quite normal, you must live with giants, lol