Download a drum sample pack mate. Or try to find a hi hat pack to download etc...
Everyone use samples.... and dont listen to the guy above... never use breaks.... make your own drums... dnb severely lacks originality.... creating your own drums is sometimes the one thing that can single you out from the rest. Take Dillinja for example... you can tell a tune is his within seconds becasue his drums are so unique to his style....
but yeh.... never use breaks or loops... it makes you lazy... make your own.
as for actually "creating" a hi hat sound.... take a microphone... and a little stick.... and hit something.... record it... SORTED.....