Burning sensation in vagina?

Hi guys I really need your help!

I have a burning sensation in my vagina which hurts when I pee and after too. I have he urge to pee regularly but not a lot comes out.

In the past I've been treated for re-occurring cystitis to the point of hospital admission but could this be the case or is this something different?

I'm only with one partner and we were both virgins before, we have only been with one another so cannot be a sexual infection.

I have a bit of lower back ache and a pain what feels like below my tummy but that is the only symptoms showing

Discharge is average and the same

What do you believe his could be from experience or general knowing.

I shall visit my doctor but would like female opinions :)

Thank you