since I was 13 I've had to wear a pad/liners every day...

I'm 16 and haven't done anything sexual. I first got my period after I just turned 12. Ever since I was 13 I've had to wear a pad/liners every day. I would have white discharge. I think it has gotten worse because it started to smell a year ago. Now, not only do I get white gunk around the outside of my vagina, but clear discharge. On my pad it is yellow. When I don't wear a pad it dries hard and white. I clean my vagina in the shower with soap but minutes after I get out clear discharge starts to drip. It is like a shampoo texture. Sometimes when I sit on the toilet it starts to slowly drip in long strands. I haven't asked my doctor about this because I assume she would say something when she does a check-up. I will be sure to ask at my next visit in a few weeks. After my period I would get brown discharge. Then it becomes yellow and starts this over again.