If you want to interact with customers find a way to spend some time as a customer support agent. It's an enlightening experience and can often be a good way to

If you want to interact with customers find a way to spend some time as a customer support agent. It's an enlightening experience and can often be a good way to grasp how different people are when it comes to how they use computers. As for fearing that you can't sell something the only way to deal with the fear is to attack it head on. Build something simple that solves a problem that you and your close network (friends and family) have. Do it as a side project so you can fail without too much pain. Wash, rinse, repeat. On each cycle try to expand beyond your network into places where your customers might be. Trade groups, conferences, user groups, etc. Just keep doing until you succeed or decide it's just not what you want to do right now.