i used to dress kind of "goth" when i was going through puberty.
Just say they're making a fuss out of nothing. You just want to express yourself.
Think about it first. You can have the style, but you should try to look nice and presentable, and be clean too. Try being yourself as well.
Dont call yourself emo, unless you wear the make up, do the hair, and all the weird clothes, kiss other boys and avoid working out.
Just ignore what people say. Be confident about the way you dress. Im sure you'll grow out of it when you're older...