Vaginal Odor TMI PIC

From my experience, sometimes when were having sex, ill smell like a metal scent but its not a bad smell in my opinion. Other times my underwear will smell musty. Sometimes ill be sitting in class and i can smell it. Thats alarming to me. Ive gone to the gyno multiple times but they always say im fine. I also have lotssss of discharge. I dont understand :( it hurt my feelings when my boyfriend told me that. We've been together for a year and a half and this is the first time he speaks up. I clean myself very well with unscented, sensitive skin soap and i air myself out every night. I never douche or use fragranced products. I need help. Anything. Its so sad :( i dont even want to have sex anymore. I feel so insecure.