Its not easy to understand the subculture that has been around and evolved slowly since the late 70's.
But you are a goth if you feel like one

share some interests, appreciate the aesthetics and generally associate with goths.
With so many subgenres of looks and music that fall under the label of goth you can pretty much do as you please. It is not "any color that you like as long as its black" type of scene anymore
And it is equally divided between music, fashion, literature, film and games (in a past decade).