Hi,
From what you describe, it sounds like a natural odor. Every body has their own natural, unique odor. If it's not fishy smelling or really foul, I would say there's nothing really wrong. Now if you happen to smell it several times during the day through your clothes just going every day normal activities, then maybe it would be abnormal, but it sounds like you eat right, take good care of yourself, so again, I would say it's normal from everything else you describe.