[watwut]

I would suggest to read up on requirements gathering, analysis and maybe negotiation. One thing is small talk and socialization - but your problems with marketing and sales are not that. The issue is not that you don't have good enough small talk. It is that you don't know what you are expected to do. That is literally requirements gathering.

Reading up on that should you allow to formalise process of communication a bit more. That in turn helps even to highly social people. It should help you even more.

Lastly, guys "that you simply give tasks to, and ultimately the job gets done" are awesome to work with, even if they don't chat much. Really. Have collegues like that and they are great to be in office or team with.