Emo is not one thing, it is actually multiple things, and either can make you Emo;
Emo is a style, wearing dark clothes usually
black,
black painted nails/hair, and the hair can be shaggy and swooped across the face usually long. Emo can also be a mentality, someone who is in tune with their own emotions, they understand themselves, self harm too but we dont talk about that. One more thing that could make you emo is music taste, for instance, all types of rock and
metal genres
fit into emo. Some artists that would fit the emo genre would be:
Joel Faviere, Get Scared, Black Veil Brides, and so on.
You dont need to fit all the criteria to be Emo, just one is
fine, And if you fit some of it and dont want to be called Emo, then thats alright, you do you.