You poor thing, it's a shame that kids are so mean. They can only effect you if you are insecure with yourself. When you feel the nervousness coming on, don't run away from it. Just embrace it, let it be. The opposite of insecure is not secure as no one is fully secure of themself all the time. The truth is too allow yourself to be insecure and be okay with that. Stop trying to fight it.
We are all human, I'm sure if any of us were dropped out of an airplane at thirty thousand feet with no parachute, no one is going to say, really is that all you got? Just admit you are who and what you are. When someone comes at you, it doesn't matter what you say. All that matters is how it effects you mentally.
You just have to laugh at how funny it is, because it really is funny. Smile as you think to yourself, these pathetic people, so insecure of themself, they have to insult me in a futile attempt to bring me down so they can puff themselves up a little. As soon as you show signs of it not bothering you, they flee like the cowards they are. If you truly get this though, you can really have fun.
Because at that point you can chase them. Bullies are all the same. They search out and poke at people until they get a severe reaction. Once they find the reactor they jump on them, which in turn signals other bullies who will feel more confidant in numbers to do the same. You will find this in school, work, military, church, friends ECT. No matter where people turn with groups of people, low and behold the bullies reside. It is your reaction that is screwing you, oh and don't think anger will help you, because buillies love anger reactions the most.
