Guidence needed...

Hey lovely ladies, i've written a few posts in the past on how hard i'm finding it not being able to conceive. Well today i kinda had a melt down...my partner's brother is having a baby with his partner. They sent the scan over & i just cried! My partner is like 'what the hell is wrong with you i'm going to be an uncle'. I can't help but feel like complete shite . I've been off birth control for 6 years now, actively trying for nearly 12 months. I'm 25 & just lost all hope. I'm currently in the process of finding out what's up with me. I feel so guilty for not being excited for them, but can't help this feeling!! Anyone else felt like this? Am i going mad? Thanks guys xx