Try to find positive birth stories! There are SO many! People just tend to want to tell all the worst things they've heard or that have happened to them, and while it's good to be realistic about possible issues, it's also really important to be positive and remember that your body was made able to do this whole birth thing! You can do it! Definitely check out hypnobabies and hypnobirthing for some awesome, peaceful birth prep classes.
Prepareing yourself is good and always helpful! But keep in mind no birth story is the same! Who knows your baby might shoot outblike a cannonball:) I'd say dont worry:)