Trying seems useless

My hubby and I have been TTC for over a year now, a year and 4 months to be exact. Every month is an upset. It used to be with the appearance of AF but now for three months I haven't gotten anything but BFN. Also in this past 3 months 4 friends became pregnant after a month of trying and 2 gave birth. These girls were very close to me but now I barely talk to them more than once a week. Not because they are busy but because it hurts me inside to see them so happy or complain about getting big when I can't enjoy that feeling. I get sad or mad and sometimes i even cry. Am I selfish for feeling this way? Does anyone else feel like this? Am I wrong?