I give you three reasons that this may occur:
1: Sister syndrome - I'm not creep-able, or (so I've been told before) I'm to sweet to creep at.
2: I'm just one of the guys here. There's no reason to creep at your friends. Thus, no creep.
3: I got a ring on dis finger. (Which I hear makes people exponentially less attractive to others.)
Oh, oh wait, reason 4, Halfie's are maturing. But, but that can't be possible. I'm sure someone will prove me wrong soon enough....
EDIT: Wait, wait, I even thought of one more reason, no one actually would want to hang out with me.