Can sound therapy help with tinnitus?

Yes. Tinnitus has to be workup by an ENT before going to sound therapy. At your age tinnitus usually is rare unless you are a musician or have been going to concerts a lot or exposed to loud noises. But certain brain conditions at your age can cause it too. See your ENT doctor.
Yes. Sometimes using low level background noise or environmental sounds ie light music or rain /ocean sounds can help alleviate the loudness or intensity of constant tinnitus. It depends on the patient.