Discharge and odour!

So I've been to the doctor to check out why I've had constant discharge and odour down below, but my doc found nothing and said I just have more discharge than other people... but I can't believe that there isn't something wrong! I don't have an STI that's for sure, and the odour isn't awful but it's still there and sometimes my discharge is so bad that I wear a tampon! The discharge is a white, sometimes a light yellowish colour? Sometimes it's really thick and white and other times it's less thick and colourless. What could it be?? Help!!