I'm starting to get mean

I've never been a mean or judgmental person but I've gotten to a point where I can't help but respond to some posts that piss me off (usually from teen moms).  I just feel so cheated! Why should people who aren't ready for a baby get one when my husband and I can provide an amazing life for a baby and we just haven't been able to get pregnant?? Who sounds like a child now right? Can you picture me stomping my feet in a tantrum? I'm so emotional lately and I'm so tired. We're getting very close to the 1 yr mark and a piece of me is just dying at the thought of going to a specialist. I used to be a good person who genuinely got excited for others and while I still feel happy for them it just angers me and brings me to tears. I just wanna scream sometimes. How can I feel so much pain and longing for someone who has never existed?