Has anyone ever been nervous?

I don't have an STD, never have.. I've had bacterial infections(I suffer with a lot) & yeast infections. I have been having sex with the same person for 3 years, but has anyone ever felt like gross down there? Like even though you clean well? Sometimes I'll just say what if I have something and give it to him.. I know I don't, but I think a lot.. (Please don't judge)