I am a woman. Strong urine smell, occasional burning in vagina (not strong), vagina always has a smell, and sex is painful.

See remark. You most likely have urinary tract infection:this is treatable.If you don't have a doctor visit a local drug store and have them give you antibiotic. As for vaginal odor & painful sex ,you have vaginal inf. (at same drug store let them give you anti-fungal cream & apply twice a day.(you can douche the vagina with 1/2 tablespoon baking powder in cup of warm water 2/day .Best of health young lady.
Evaluation. This sounds like an infection or possibly an STD like trichomoniasis. You need to be evaluated by your family physician or GYN physician if possible.