Is it normal at sixteen weeks of pregnancy to start having fears over the labor and delivery, and what can I do to combat that?

Yes, it's common. Many women start to worry about labor and delivery in advance. This is normal. Talk to your doctor or cnm about your fears. Remember, women have been delivering babies for thousands of years. You can ask for pain medicine such as an epidural or fentanyl if you'd like. If ever you think that your anxiety is more than most women's, you can ask your doctor/midwife for a referal to a therapist.
Yes. It is normal. Try to find a good child birth class in your area. Accurate information should help relieve some of your fears.