@Sir:
Well, i've never made a song before... Listen is easy, but make is hard. But i can understand what you said, i know that i've just used one melody and mixed it multiple times, but as i said, don't expect something "Expert" from the one that is making his first song.
@Cacrot:
Thanks, i don't found anything better, i guess that i've just choiced the wrong beat...
anyway, thanks for all comments, i'll keep praticing and soon i'll make another song.