How do I overcome my fear of being tested?

Hi i pretty much became ually active around november of 2008 around the age of 17. Ive had about 9 partners ever since in whom ive had ual encounters with. I had with four and 5 . I know i was being really promiscuous and dumb. I havent gotten tested even once. I really want to but im scared to find out something i might not want to hear. Like HIV god forbid. How do i over come this please help. I regret being dumb and not protecting myself and putting myself at risk.