Hey Kristin,
Those feelings are normal and common for those of us who are fertility challenged, if they werent then there are allot of us on here that arent normal
I know exactly how you feel. I have been in your shoes, in fact I am surrounded by fertile myrtles who get pregnant just by looking at other babies......or their husband.

This year alone my BF who is same age as me accidentally got preggo, 3 of my DH sisters got preggo, and my SIL got pregant twice, but sadly ended in miscarriage.
I really believe I will be a mom, it took me awhile to get to that place, and even sometimes I have days that are really hard where I feel like you. I believe you will be MOM too but you have to really believe that as well. My belief has really helped me through all my m/c's and now through my first IVF. Dont beat yourself up over having those feelings, but rather embrace them and deflect them with posistive images of you with your own child.
Chin Up girl......you will succeed!