Is this normal?

I’m 15 (and a virgin, just saying lol) My period usually lasts 7-8 days and I have really bad cramps. I get nauseas, dizzy, bloated, etc. all the bad symptoms. My flow is always heavy. Like really heavy. Especially at night, but lately it’s really light and when I sleep the tampon is completely dry, and no blood even after sleeping/ being in for 10+ hrs.

Is this normal, or do I need to see a doctor or get on birth control? My flow completely stops at night. (And it is a regular Kotex tampon)