First and foremost, stop watching scary birth videos, they will only freak you out. If you want to watch birth video's google hypnobirth videos. Those are AMAZING!
And if you can, try and get hold of a hypnobirth book & CD (
www.hypnobirthing.com/) - it's quite late in your pregnancy already but I have heard of women only starting hypnobirthing at 36 weeks and still really benefitting from it. Definitely see if you can get into a class or two or at the very least read the book. It is awesome.
I had a hypnobirth (you don't get hypnotised by someone else - that totally freaks me out, it's all about focussing your mind, thoughts and body and going into a deep state of relaxation, but YOU are in control the whole time). It was absolutely amazing. Vaginal birth, no drugs, not much pain at all. It was the best experience EVER and I felt so in control and so empowered at all times.
If you're really scared about giving birth I can't recommend hypnobirthing enough. It really will put your mind at ease and help you through and help you to have a really wonderful birthing experience.