Feeling super down today.

I found out today that two more cousins of mine ar epregnant. Both are unmarried, uneducated, and living with their parents. One already has a kid by another guy and has been with this one for 3 months. Cool. How is it that some people just look at a penis and end up pregnant but DH and I  use timed intercourse, clomid, and temping and still can't get a bfp... 
I feel like crying.