Wanting to TTC but can't yet...

I want to try for my first baby, but my husband and I are not in a place where we can start trying yet. I know this, and I understand it, but that doesn't make it any easier. We have been married for 5 years, and hopefully can start trying this summer, but I wish we could start now.
A girl I really don't like recently found out she is pregnant, and rather than being happy for her, I'm drowning in jealousy and heartache.
How do you all handle your baby fever and jealousy? I know I shouldn't feel this way, but I can't help it. I feel like an awful person, because I know I should be happy for her, but I'm just not.