Hello, Sti/std stands for sexually transmitted diseases.as u have told ,u have not been involved in sexual activity for seven years so unlikely that u would contract a STD. I want to bring to your notice that the condition u describe might b reduced libido/aversion to sex .might be indicative of hypoactive sexual disorder/sexual aversion.kindly share your age and other details of health to get a overall view of problem.also consider contacting a psychiatrist/sexologist