How can I help relieve my vaginal tightness?

Varies. If due to spasm of the muscles then pelvic floor therapy, treatment of other sources of pain and medications maybenefit. If anatomical then stretching with dilators and possible surgery. If history of abuse counseling and pelvic floor therapy may be in order. If postmenopausal vaginal estrogen may help as well.
No. Tightness of the vagina may be the results of pelvic floor muscle spasm. This can be treated with muscle relaxants & pelvic floor physical therapy.