BFN again...

Second cycle of TTC and I got another BFN. SO is acting like its no big deal and keeps changing the subject and getting pissed at me for crying about it. I'm so upset and I feel like my body isn't doing what nature intended it to. I know there are couples who try for years and I'm not invalidating them at all, but two cycles and two unwanted periods later and I'm so bummed and sad and I feel like no one understands. I'm 22, I'm young and my body is at its prime so why isn't it working???