Feeling frustrated and need to release

My husband and I have been TTC for 2 1/2 years I've recently started going to the dr to see if I have any fertility issues. I currently have 5 friends that are pregnant, two that I'm very close with. It's getting very hard for me to be happy for them and their little miracles. I don't want to be the bitter no baby lady but I'm almost 30 and I'm afraid that I'm never going to experience being a mother.  I truly am happy for my friends and anyone else who is having a baby but it does feel like a Pitt in the bottom of my stomach or a hole in my heart when I hear of a new pregnancy. Is it completely awful that I feel this way?