Discouraged (Sorry, long winded)

My SO and I have been TTC for about 8 months now (which I know isn't as long as some women here) and having no luck. The women I work with have been asking "When are you going to have a baby?" "Why aren't you pregnant yet?" Every time they ask I just want to break down and cry. It's not from lack of trying. 
I also have a couple close friends who recently became pregnant and confided in me early on. Lucky for me they told me via text, because my first reaction was a mixture of pain and disappointment, so I was able to throw myself a quick pity party before I put on a happy and congratulatory, brave face. Don't get me wrong, I'm happy for them but they weren't trying. I'm just starting to get really discouraged that it's not meant to happen for me. 
I guess I just need to vent, or maybe I need some words of encouragement. I don't really know what I need, all I know is that I don't know what else to do.