How can I at least show my feelings for my best male friend?

He and I are thirteen-years-old. We both have very tough lifes over a parent abandoning other parent around birth, though mine is super weird including that this time the mother was who abused the father and then left. There are also other things that he and I only talk to each other about. We're both made fun of often in school. Sometimes I sort of fantasize about him. I'm not sure if he likes me more than a friend in ways, as I've been getting mixed signals. I'd like to know how can I tell him how I feel about him, express some of my feelings towards him, and possibly ask him out.