Hi,
Welcome to ehealthforum.
Your symptoms (my vagina and urethra area swollen and hurts when i walk and when i sit) suggest vaginal infection and/or injury.
It is not uncommon to have these problems after having intercourse. Do not hesitate to visit your gynecologist for an evaluation and examination along with tests to confirm/rule out/identify infection and start you on treatment as indicated.
Early diagnosis and treatment is the key to avoid complications like extension of infection to bladder and pelvic organs and pain.
Take care.