I'm sleepy, forgive me if I ramble or leave trains of thought unfinished.

You say you want a waifish goth type who's also demure(and presumably doesn't cut herself). Your best chance of finding one is to sift through as many as possible. The easiest way to do this is to find them where they gather in groups, like goth/fetish nightclubs, vampire roleplays, and Denny's. The only way you're going to get into these places is by dressing the part. Therefore if you really want this, you're going to have to become the thing you're looking for.

You want someone bleak? Hang around the existentialism books in your library.

You need to honestly ask yourself why you want such a specific type of woman. What is it about you that makes that type more desirable?

Or give it another two to four weeks and see if your tastes change again.