Please prayers needed

I'm in a bad spot right now, I'm feeling resentful against my lord and savior because I can't get pregnant. I've been married since 2012 and been ttc since November 2013 with not a single positive test. Found out in December my sister in law who is on drugs not married is pregnant. Then tonight I find out my other sister in law who is 18 not married and doesn't even know the daddy is pregnant. I've had it. I wish god would either let me get pregnant or take the desire for kids away. I'm so Hurt.