Would love a baby but im terrified! help!?

I WOULD LOVE TO HAVE A BABY AND CNATS EE MY LIFE WITHOUT ONE A T SOMEPOINT BUT TO B HONEST I HAVE ALWAYS BEEN A BAD HYPOCHONDRIAC! I KNOW ITS STUPID BUT ITS WHO I AM AND I CONSTANTLY WORRY ABOUT THINGS REVOLVING AROUND PREGNANCY. FOR INSTANCE, EVEN THOUGH I HAVE NEVER BEEN PROMISCUOUS, I FEAR THINGS LIKE HIV AND DISEASES. I REFUSE TO GET TESTED BC IT WHAT IF IM THE ONE WHO HAS SOMETHING LIKE THAT AND IVE BEEN SO RESPONSIBLE. AND THEY FORCE YOU TO BE TESTED FOR THINGS LIKE THAT WHEN YOU GET PREGNANT AND THEN WHAT?!! AHHHH- SO NERVE RACKING. ADVICE?!