This is really an example of where "fake it 'til you make it" is important for both you and those around you.
If I did it all over again, when people gave me the horrid comments and terrible looks when I said "Girl #3" I would have given them the most bewildered look and said very flatly, "What's wrong with girls?"
Unfortunately, I still have to use that now, but not as much as when I was prego with DD3. The comment doesn't say you are thrilled, it is just challenging the persons stupidity and lack of tact.
My heart goes out to you, but I REALLY think if you start faking it, you will feel a little better. You will eventually attract that type of energy too and then it won't be so hard.
Their is an end to this dark tunnel of GD, I promise. Hang in there.