What’s going on inside of me

my

I’m having some burning discomfort after I pee and I’ve been using the bathroom very frequently but also been very thirsty drinking 2 or more bottles of water a hour. My pee is clear and has no smell I’m sexually active of course. I’ve also experienced some cramping , nausea, and constipation but my cycle is due in 6 days can anyone relate or tell me what might be going on I’m scared to go to the doctor or tell anyone I know