What Causes Vaginal Discharge And Painful Sexual Intercourse?

I'm 20 female, hight: 5,5ft and aprox 60 kilos.penetration when having sex is painful and burns a bit.I can feel a sort of spot or something just on the inside but I'm not sure if this is normal. I have a bit of white discharge but it doesn't seem to smell or anything. It doen't hurt or burn when I pee but it can be a be ichy. I've had miner vagina infeccions before but this isn't the same. could it be thrush?