So close to giving up.

I've had a slight problem with cysts since I was about 16, got put on depo and it made me really sick and for roughly 2 years (till I was 18) I was absolutely irregular. Now I'm 21, my fiancé is 24 and we have our own place and have decided to try for a baby. It's been roughly 6 months and nothing (we tried "natural") well for the past month I've been using ovulation tests. From CD 7 ( 3 days after AF) and it's now CD 24 and I never even got a faint line. Tested twice daily and very single test had just one line. On top of that my best friend is pregnant with #2 3 months after surprise #1 she's only 19. My roommate is pregnant and her Bf wants NOTHING to do with it she's only 18. Andddd my fiancé' 19 year old brother is having a baby with my 16 year old cousin all within about 3 months of each other... I feel like the universe is mocking me...