TTC since Feb 2014

I just need to rant for a bit. We've been trying to conceive since I got the impalnon taken out in feb of last year. Weve honestly been having fun bding but when I wake up in the morning and see af it tears me up inside. I've had two chemical pregnancy and nothing's ever been longer than 8 weeks. All of my friends can have kids without a problem. We've been together for 6 years and are having trouble and yet my coworker can make a baby with her meth head boyfriend of one month. She's 17 weeks now. I just don't understand it. I want the bfp so badly. I know he wants this too and I feel like I've failed him. I know he's not the problem because he and his gf previous of us had gotten pregnant, however she aborted it. I just don't understand why it's so hard. So many people get pregnant without trying.