So when it comes to what your interested in you typically fit a role to some extent. Most common being that you fulfill the visual role of a stereotype somehow. If your a jock you look like you exercise a lot. If your a prep you dress well, have nice hair, and know whats in. When your a nerd your (very) scrawny or chubby, wear glasses, get picked on, and don't get any girls.
Stereotypes drive forward many mediums today because they're easy to describe and design. However they aren't that real. Certainly they exist but they really don't look like what you expect them to. One example would be Vin Diesel, a large muscular actor who got his name from how much energy he had as a bouncer. However his oldest past time is tabletop gaming Dungeons and Dragons style.
check this vid it's a better explanation than I can give.
Don't judge a book by it's cover