It's just not fair!

My husband and I were very excited last year when we found out we were pregnant after our first time trying. The excitement was also short-lived when I had a miscarriage a week and a half later. I had my 2 normal periods before trying again. Well, we've been trying since October and nothing has happened yet. My friends are also all getting pregnant. My husband and I have been together for seven years, and we have been married for three years. My cousin just met her husband last May, got pregnant in November, married in December, and is coming to the end of her pregnancy. I'm happy for her, but I can't help but feel bitter. We've wanted our baby much longer than she wanted hers- does that even make sense? I'm just tired of getting my hopes up only to be disappointed. I'm losing faith that it will happen for us. It's been really hard on both of us, especially with pressure coming from both sides of our families. Anyone else out there feeling like this?