Experiencing pain in my lower back.from my right side to my back .what could it be?

Many causes: Low back pain can be caused by muscle strain, arthritis in the spine, pinched nerves, and even gynecological problems. If the pain is severe or persistent you should definitely be evaluated by a doctor.

Many Possibilities: Depending on how long it's been going on, i would consider an evaluation by a spine specialist. Sometimes it could be a muscle imbalance, early onset arthritis or scoliosis. Also could be a pinched nerve/herniated disc. Either way it might be good to figure it out and get appropriate treatment.