There is nothing to be embarrassed about. We all poop! We all have questions at one time or another. I had, I kid you not, very green stool last week. You know what it was? Lucky Charms cereal, a lot of it, which I never eat but was stress eating and got into some summer (spoiling and not doing our usual thing) cereal for my kids. The die in the marshmallows, I've learned, is well known for changing stool green.
I would have gone to some kind of dye in your food for sure as the first thing to consider. Something else is supplements. Do you take any? If you take one that contains beta-carotene and aluminum hydroxide, that can change stool color to orange red. There is another reason which is medical, which is lack of bile salts. Lack of bile salts happens usually either because a person has the underlying conditions of Chrohn's diesease or Irritable Bowel Syndrome. Obviously, the other concern is that it is actually blood from your GI tract.
So, is there any way you can see the doctor? I would not think anything serious at this point but still think you should make sure it's not. :>)