The word geek is a tough one to nail down. Technically, a geek is:
1. a carnival performer often billed as a wild man whose act usually includes biting the head off a live chicken or snake
2. a person often of an intellectual bent who is disliked
3. an enthusiast or expert especially in a technological field or activity
And current usage conforms more closely to:
4. a person who is socially awkward and unpopular : a usually intelligent person who does not fit in with other people
5. a person who is very interested in and knows a lot about a particular field or activity
You'll notice that the current usage results in a definition of "geek" that is relative to the people surrounding the person in question, as well as their knowledge of a subject relative to those around them.
So you might not be considered a "geek among geeks", but I've met a number of guys who like other "typical" guy stuff, like outdoor excursions, sports, etc, but have little to no interest in sci-fi/fantasy movies. Among this crowd, you would probably be considered a bit of a geek, whereas at a geek convention you might not be.
In my book, if you have enough interest in geek-genre entertainment(by that I mean entertainment with a fantastical theme of some kind) to come and engage with a website like this one, you've got a fair amount of geek in you, since your interest (and likely knowledge) of some geek subjects goes beyond the norm.