Can i become paralyzed from a herniated disk ? i haven't had a road accident but very worried as my walking is bad and weak legs

It is possible: It is rare but a possibility to get cauda equina which is a condition that can result in bilateral leg weakness and permanent bowel and bladder dysfunction.

A very large disc : Herniation in the cervical or neck area or one in the thoracic or chest region of the spine could cause a condition such as that especially if there is a congenital narrowing of the spinal canal. These are not common scenarios and do not need a specific traumatic event for one to occur. You should be evaluated by your doctor concerning your current symptoms.