eh
First where does it say you have to wait...
Seriously, it's a two way street... These things you mentioned could honestly be flipped back at ya... What if you don't call, what if he sees you and you two don't talk. At 16, if he does like you, he's prolly bugged out as much as you... Funny thing is, he might even be posting on some other board about the whole situation...
Life is funny like that.
But, making someone feel at ease generally is the most common rule that works well in most situations.
Best of luck