hi back pain very common problem and affects a lot of people. it is not a serious problem in the large majority of patients. it usually resolves with treatment and exercise with maintenance of good posture . But some patients (<5%) with back pain can have a serious underlying disease and appearance of back pain at your age group can suggest that you might have a disease called ankylosing Spondylitis which causes severe back pain in young men . This disease causes back pain especially when they sleep and reduces when they are up about an active. It needs to clarified whether you have the same. I would recommend that you meet a good rheumatologist at the earliest.