Sight by Adrienne Vrettos
Dylan Driscoll is a teen psychic who sees visions of children who have been kidnapped (usually just before they die). She's had these "visions" since she was five, and has never told any of her friends, until her friend's little sister disappears and she must face who she really is.
This book has a pretty awesome concept, but took WAAAAAAAAAAAY too long to get to the point. The action didn't really start until about 50 pages from the end. I'm actually amazed that I finished it. Big NAY from me.