Sorry, in this I can’t help you. If your parents did not help you with the genetic material, my chances are even less. I don’t believe you can learn that. You can read a lot of books about that and learn every day, but you will look always somehow like a “clumsy” person in front of clients, because that’s not YOU. Simply, you have or you don’t have communication skills. Save your time and don’t choose the salesman job or any job where you could work with clients (and your salary depend from them), if you don’t have that in your blood, or if you are introvert person.

If you are bipolar person, its ok, but only in case if your have super-high-energy mood at work and bad mood (depression) at home J.L.