At the risk of sounding condescending, this makes no sense to me. You state you were going to the range for sometime. Next you state you realized you were not ready for "that responsibility". ??
It is also peculiar to me that you also mention the requirement of I 594 and at the same time profess ignorance of registration.
I suggest you first read up on RCW 9.41 http://apps.leg.wa.gov/rcw/default.aspx?cite=9.41; any remaining questions you have after reviewing the RCW will likely be easily fielded here.