Having Trouble Closing A Sale

I am a fairly new salesman at a BMW dealership. I love cars! I love talking about them and I love meeting the people who also love BMW's. My biggest challenge is closing a sale. I have asked some of my peers for help. They may be sincerely trying to help me but it still has not registered with me. Someone told me that I talk too much. Others have told me that I might be a tad too aggressive. This may be true but I am just so excited to get my customer into the driver's seat that maybe (just maybe) I am a tad aggressive. Please help!