Closing a sale requires at least three things: you need to get yourself in front of the person with purchasing power, you need to build trust with that person and convince them they want what you've got (much easier if the product is good and you believe in it), and you need to give them enough of a feeling of urgency that they don't delay and talk themselves out of the sale.<p>The bad news, all three of these are easier to learn when you're an extrovert.<p>The good news, it's possible to learn all these skills and push yourself to become more extroverted.<p>A couple good books that help you become extroverted in the right way--How to Win Friends and Influence people (corny/scammy sounding title but a true classic, the tldr is--be genuinely interested in people if you want to be interesting, listen, smile, remember people's names, apologize when you're wrong really quickly)<p>Another great one is Never Eat Alone, by Keith Ferrazzi. Basically, take people out for casual lunches, but do it ALL THE TIME, try to help them even if they can't help you right now, introduce people to other people who can help them, etc.<p>Then the hard part, get used to talking to strangers. If you want to learn sales, you have to get over that fear. I'd say start, get used to saying hi to everyone you encounter throughout the day and trying to have a friendly conversation--hard for an introvert, but like going to the gym, it'll make you stronger and that subtle social confidence will pay off in a sales meeting. (Plus, you never know what random interaction will lead to a sales meeting).<p>Also, to be honest, there are a lot of similarities between closing a sale and dating. The difficulty is that in the second you're selling yourself, so rejection stings a lot more and the approaches can be a little scarier. That said, if you can strike up a conversation with a strange man or woman you find attractive and get them interested in you, you'll have no problem learning to sell any other reasonable product.