You probably just think he is really awesome. You are 13, not too abnormal to question things.

Bro, don't like guys.

I find this adorable. I seriously can't stop smiling.

He can like whatever he wants.

^This, but imo you probably just feel lust (think he's attractive) or as others say that he's just really awesome, even if i'd try figuring out which one it is using face to face people. :p Don't let trolls bum ya out you know? It's normal to question around that age (I sure did, it's basically when I found out I liked guys)

go for whatever your heart desires man
its probably not a crush more along the lines of fascination
and because of your age your still developing and going through puberty
nothing wrong with liking a guy. i used to be into chicks lol

Follow your heart and you'll never be wrong. Wether you have a crush on him or idolize him will be made clear by your emotion's. Hope this help's.