“Can you have a normal life after back surgery?”

Sure!!

Yes, it is possible. Of course, it depends on what you mean be "normal life" and what kind of surgery. Simple disc surgery should leave you with the ability to do any activity you would like, while more complex reconstruction of the spine will allow you to function in normal daily life but would limit you ability to perform contact sports. I would encourage you to have a discussion with your surgeon about the expectations of the surgery.

Depends on the problem and the surgery..Many surgeries can be successful but not all.