Reddit mentions of The "I Hate Selling" Book: Business-Building Advice for Consultants, Attorneys, Accountants, Engineers, Architects and Other Professionals

I recommend "I hate selling" book. http://www.amazon.com/Hate-Selling-Book-Business-Building-Professionals/dp/0970933703 You are a doctor diagnosing a problem.
I am part owner in a business and I will interpret to the best of my ability. "I am told I am negative"- this probably means that you say "can't" or "won't" too much. As in "I can't get this ordered" or The client won't agree to the terms". Try changing those words. "I am having a difficult time doing X, do you have any suggestions?" "The client is about to sign but is concerned with X, how is that handled in the past?". Now for "Dispassionate" - do you give up? do you not celebrate a win? do you not celebrate some one else's win? Do you initiate client contact? Do you dress snazzy at certain times? Do you arrive 10 minutes early for all appointments and work? Do you seek out answers when you are stuck?
Please- I am not diagnosing you or saying that you are wrong but there is power in words. Just making some positive switching in the words you choose may change their perception of you. You are still you (and you are fabulous!) but you have now laid claim to their mind and can control how they see you and how they see themselves with you. When my kids were young I would ask "may I assist you?" < kid is in charge and needs a team mate to do what they want to do> instead of "may I help you?" <you are incompetent to do this and I have to come in and take over>.
Words are power. You have the power already- use it. Make it easy for yourself. and btw, you are also charming and good looking.