Childbirth, pain and vaginal stretching can anyone help?

[Maria]

I am 25 and intend to have children with my partner once we r married.

We enjoy a healthy sex life we both think i know my body really well. He has had a few sexual partners and has commented that my vagina is extremely tight (in a good way) i also feel this and it is very pleasurable. I even do pelvic floor excersises during sex for fun!I am worried about giving birth as i believe that my vagina is tighter than average. Some people have told me it shrinks back and others have told me it does not. Cos i know my body so well, i know i will be able to feel even a slight difference.

I am also worried about vaginal tearing or being cut during child birth.(is this common?) I would also like to know if the majority of the pain comes from the stomach area and if this will block out the feeling of the vagina being ripped. Women always comment on the contraction pains but rarely mention vaginal stretching pain, i want to know why. The thought of this really really scares me.

Please help
thanks for the advice so far, i would also like to know, do they cut just through the skin or through the muscle between your vagina and bottom. i only have a very small space about an inch between the two im worried that the two holes will be cut into one, ive looked at diagrams of this but they really dont help.

thanks