1) "Other cultures". I'm never sure what to think about this one. I haven't done a lot of research into what other cultures expect from birth.
I learned a lot from Adrienne Lieberman's book about dealing with pain in labor and her chapter about the concept of pain in a cross-cultural perspective was intriguing and seemed to resonate better with me than the pat answer given by some people that " all women in Africa would birth their babies and then work in the fields 5 minutes later".
If you look at illustrations of Native American women, women from other centuries in England, etc. etc, you'll find them in various positions that ease "pain" and that help a woman's body work productively (ie: hanging from a tree branch or pulling on a rope tied to the ceiling). In one culture (can't think of which one/s), a special blend of herbs to dull the pain was given, and stories go on and on. These are cultures where there are no doctors, nor hospitals, but the reality of childbirth was as real then as it is now.
There are also stories and accounts given by women and also be attendants that describe painless births. Read about some here, if you are interested.
To really make sense of the question, one needs to read both (many?) perspectives on the question.
There is so much to read and learn about. To OP: Yes, painless labor and birth is possible for some (many?), but if it doesn't happen for you, should you feel guilty, as though you'd done something wrong? NO! Perhaps ask if things *could* have been done differently to facilitate less pain, but accept you did your best. This allows for learning and growth in a healthy way. If you want a pain-lessened or free delivery, should you give up b/c someone else had pain in labor? NO! Make decisions that fit your own needs and have faith in something.