What Causes Burning In The Vagina At The End Of The Intercourse?

hi, i really need help to know whats wrong with my vagina its buring everytime during towrads the end of intercourse and after for 30-60minutes we use lubricant so it cant be cause my vagina is dry and when i urinate it just makes things worse, its the same thing with my boyfriend too, also just after 30minutes it sometimes itches a little but the next day my vagina will be fine what should i do?