There is something seriously wrong with my dehydration

I dont know who to speak to anymore. I have been drinking 6-7 liters a day and its getting worse. I have tried to drink only 3L, but my throat starts to hurt after only an hour of not drinking water.I constantly have to drink big gulps of water to be hydrated for even a few minutes.My urine is completely clear most of the time.I have ditched using cups a long time ago.Its excruciating to have your throat completely dry if I dont have a big bottle of water beside me.My sugar levels are normal. I wash my tongue every single day. My parents who are both medical workers refuse to take me to a doctor, telling me im completely fine.What do I even do?