Suggest Treatment For Vaginal Pain

Why does my tint hurt? It feels like it s been cut. I have a u.t.I but I ve been on antibiotics for 4 days. I don t know if that has anything to do with it. And I am sexually active with my boyfriend. It started hurting after sex yesterday. And has done this before but it does not always hurt after sex. Ts red and burns when I touched it.