Welcome to the forums, I hope you have a great time here
Now, you don't actually need to defend whether or not you see yourself as a goth, because truly, who can tell you what you think or feel?
Now if we have to go into the technical definition, it has to do with the gothic rock music genre, but feel free to put whatever labels on yourself that you feel you need
Personally, I am a flying cheesegoat, and no one can come and tell me I'm not!