Man some of you guys are way harsh. OSaS is right though, some people's voices are just naturally higher or lower pitched than others, but that doesn't mean you can't train yourself to sing high. Its about developing a strong head voice, really. I'd suggest you go to a vocal coach and take lessons on how to do this stuff propperly, because otherwise you'll either a) wind up not improving much or b) get some bad singing habits and fuck up your voice.
But you can have all the right training and still not sound like Daniel, or whoever you're trying to. Everyone's voice is different. Learn to appriciate the unique quality of your voice. Personally, most of my favorite singers are ones that, might not be as technically good as some other guys, but their voices are unique, so to me, that makes them special. Lots of guys can belt out high head voice shit, but how many guys are out there who sound like Piet Sielck?