Are you really DJing by using the sync button in Traktor? The simple answer is Yes! It is ok to use the sync button, in fact use this extra time to hone in on your mixing skills. Read the article linked below for a very interesting read.
Sync is not mixing, but is automated beatmatching
Sync is not the death of DJing
Sync will not make you into a DJ
Sync will not fill a dancefloor
Sync will not get you gigs
Sync will not get you laid