I'm a 13 year old boy and is it normal if i'm attracted to this?

I love this girls legs and feet and i get my dick hard and picture her in a thong and ankle bracelet and get horny to this a href="http://i.pbase.com/u46/bustamante/upload/29718399.TinaSepia.jpg" rel="nofollow"http://i.pbase.com/u46/bustamante/upload…/a is it normal??