I noticed today a little kinda paper cut like owie on the outside of my vagina. I am not sure what it is. I have been with the same guy for 8 years and we both tested negative to any stds so could someone please help me so I am not freaking out.

It could be lots of different things. The only way to know for sure is to go to a doctor and get it diagnosed. Your previous STD tests likely did not included herpes testing. It is not included in the standard STD panels, you must specifically ask for it. When you see your doctor, make sure you are very specific about what you want.