Since I can remember, probably since puberty actually (I'm 21 now), I have had a foul smelling odor "down there". No itchiness and no burning, but i have noticed lately that my discharge every now and then has a green-yellowish tint to it. I was reading online that the green-yellowish discharge is a sign of trichomonas which is an STD. Because I am in the Air Force we are required to have an annual pap, and I've actually been having 2 paps a year since I was 16 and have never shown up positive for an STD. During my last pap I finally worked up the nerve (because it's such an embarrassing issue) and I brought the issue up to the doc. she took a swab and examined it under the microscope to see if i possibly had bacterial vaginosis, but said everything looked fine. I know I am not imagining this, so what could it be?