Am I weird for liking skinny guys?Watch
But seriously, you certainly won't be the only person to be particularly attracted to a certain type of build.
But no, it's not weird at all, it's perfectly natural to have certain preferences, if yours differ from your friends or peers, that's absolutely fine, there's nothing to worry about.
In all seriousness, I don't think there's anything wrong with it. Everyone has a different preference.