This is a sales-based industry. Period.
I was in dealership management for about 5 years, so I can identify with your situation. Your background in "Buy it NOW" sales can both help and hurt you.
There are certain instances (such as listing presentations) when a more aggressive stance will benefit you.
When showing houses, dealing with contract negotiations, and dealing with potential buyers from your listings, you would do better by easing off of the gas a little. The car sales mentality usually hurts you during these times. Moreover, the service aspect that Jim spoke about is more important in R/E than in other, smaller ticket industries.
I think you would do well by listening to Mike Ferry (real estate sales trainer). His approach is close to what you are used to in your previous industries. He will show you how to hone it for R/E.
www.mikeferry.com Good Luck!