It would be good to know how this pain started, for example if it has been a gradual pain that has built up over a period of time or if it came on suddenly, or was associated with a fall, twist, or lifting a heavy object.
In your age range and with the symptoms you are describing, which include both back pain and a tingling
sensation in the leg, the most likely possibility would be compression of a nerve running from the back down into the leg. This can occur for a variety of reasons, but the most common would be a herniated disc pressing on the nerve right where it exits the spine.
It is always worth getting these symptoms checked out. Although the treatment for a herniated disc is generally at first just rest and antiinflammatory drugs (followed by back strengthening exercises) your doctor
can examine your reflexes and the strength in your legs to make sure the symptoms are not more severe. You should also mention to your doctor if you are having any trouble with bowel or bladder control or any other unusual symptoms as these can be signs of a more serious nerve problem in the spine.