I struggled greatly with this and sometimes still am bugged by it. Why some women can get pg at the drop of a hat or have 'oops pregnancies' while I went through sudden premature meno at 22 y/o just blew my mind. I wondered what it would be like to make love to my husband and have a baby result from it.....and not spend thsounds of dollars too.
One thing I did do to help deal with all of these emotions and feelings to was have a great therapist. She's been with me through all the infertility, DE stuff, etc. She knew the heartbreak of infertility, but her time was before IVF was a tested and true option (late 80'). So they adopted four kids (at birth).
Even now after having my two DE miracles three yrs ago, I still get miffed when I see how easy it can be. Infertility never really leaves our heart, although obviously it is much less controling now.
Hang in there. If you don't have someone to talk to, I highly suggest finding a therapist you like.