IF stinks!

My DH and I have been trying since Feb. '08 (for 32 months now) and have not had any luck whatsoever. My cycles are mostly normal, although I am an elementary school teacher and subject to job stress on occasion, leading to some abnormal length cycles. My cycles have varied rom 29 days to 40 days (with most being about 31-32 days). I have been tested for hormonal imbalances, thyroid problems, PCOS, etc., and have had NOTHING wrong with me. "Just relax!" says the doctor. Hard to do when you're nearly 32 years old and everyone who graduated from high school in the same year is on baby #2, #3, or even #4. I have had a (former) friend who is currently expecting #5 and who gets easily pregnant ask me, "What, you've been trying for two months and you're still not knocked up yet?" (!!!!!!). Since then I have taken her off of my Facebook friend list because all she does is complain about her older babies and brag about the new pregnancy. Likewise, my sister has two kids, and all she does is complain about what is wrong with them--illnesses, asthma, behavior issues, etc., and almost hardly ever brags about any of their accomplishments--ever. Those poor kids are going to be in therapy when they are older because it's clear their parents don't appreciate them. But my DH and I are childless. Never have been pg. Never have I seen the positive pregnancy test. NOTHING. On top of it all, DH is disabled and already has that working against him psychologically--so IF has hit him very hard. We're approved to adopt, and now there are no babies available to adopt. We're taking it very hard and I go through a depression every time AF arrives. At least our parents don't pressure us, but I personally can't stand it when even other women going through IF get pregnant and I don't. :(