Ranting just a little bit

My SO and I have been TTC for months and still no luck. I sometimes get depressed when I get a BFN. And it seems like most of my friends and just everyone around me is getting pregnant. And it kind of makes me jealous because they make it seem so easy. I'm 21 and a girl who is barely 17 is pregnant before me and I will admit I was mad at first and now I'm just sad because I feel like it's just not going to happen no matter how hard we try. Am I the only one who feels this way??