How do I sing high without sounding like a girl?

When i sing high i sound kinda girly, how do i fix this or whatever to
sound like ya know, a boy. Like this video for example, the boy
sings high and sound like a boy!
http://www.youtube.com/watch?v=lF0i7_NcnlA

How do i sing high and hit high otes without my vocals sounding
girly?? (YES I HAVE HIT PUBERTY AND NO IM NOT JUSTIN BIEBER)