Medical jellies/women with children- perineal tears?

My husband and I recently started trying to get pregnant, so I have been doing a lot of research on pregnancy and birth, etc. I had never seen a video of the birth process until now, and in my research I came across perineal tears. It may just be that I am stupid or overreacting, but this totally freaks me out. How can I ease my mind about this? I am sure I will eventually “get over it” since I really want to have a baby, but for some reason this has just put a temporary stop to my wanting to try. Help!