If you’re a struggling salesperson, it’s easy to think that great salespeople must've been born that way, not made. But nothing could be further from the truth. Sure, some people just have “that thing” that makes them immediately great at sales. But that’s not true for the masses. For most of us, and for introverts, in particular, getting ahead in sales means following a learning curve that builds up to a trajectory that propels you into success. Fake It Until…