I got teased and bullied all the time as a kid and teenager. Life was hell back then.
I don't often get teased now, but then I am decades older, I live alone, due to health problems I don't get out much, so I don't have to deal much with people any more. My life is much less stressful since I started living alone several years ago. Living with relatives who bullied me because they thought that it would somehow make me normal was rough.
I don't have any real advice on how to deal with teasers and bullyers. I guess you should just try to avoid them, because nasty people seem to like being nasty, so you can't make them stop. Sorry, but that's the best I can do.
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If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau