I'd say that it isn't because you're "scary" but because you aren't the type of girl that guys who would just approach girls would go for. The kind of guy who casually hits on random girls is looking for someone bright, open, fun and easy looking. A goth girl doesn't really look like a good time to them so they won't bother. But then again you probably wouldn't want a guy like that either.
Just be yourself and you'll eventually find kindred spirits
I've been dressing in gothic/victorian style for years... Of course, there will ALWAYS be ignorant people looking weird at you, and think you're just a scary freak, and it hurts because they judge you without knowing you personnally. But as years go by, you learn to don't give a flying f*** about it, it just come naturally as long as you're feeling good in your own skin :)