Is this bad..?>?>>>>?

im thirteen years old im five foot six and i weigh 110 is this bad like fat or wutever iwant to weigh like 100 what is an easy fast weigh to loose a little weight but nothing un healthy please http://i303.photobucket.com/albums/nn145/luvablieclueless/jagsphotographs.jpg hers a link to a picture my ribs kinda stick out thats why its whyder on the top