22 years and i've knock knees and i suffer from back pain for a year and recently i start feel the pain in hips also is that because of knock knee?

Hips => knocked knee: Internal rotation of hips (anteversion) can be responsible for knocked knees. Occasionally the source of the knock knees (valgus alignment) is at the knee. Knee valgus can be corrected with a distal femoral (thigh bone) varus producing osteotomy (bone cut) that is secured with a plate & screws. A DFO (distal femoral osteotomy) will straighten the legs and help correct the knock knee appearance.

Orthopedic evaluatio: obviously, you must be examined and get xrays of your hips and knees: either or both of which can cause your issues.