So upset and frustrated

I really thought I was pregnant this month. I had gas, bloating, slight nausea for three days before AF was due and I kept thinking I saw faint lines on pregnancy tests. I just felt different and thought this could be it. My period started yesterday and this makes 12 months we have been TTC. I feel so frustrated with myself and feel like such a failure because I haven’t been able to do the one thing that women are designed to do. I found out my SIL is having a baby and she wasn’t even trying and a girl I work with got pregnant while on birth control. It just seems so easy to others while I sit in the bathroom and cry my eyes out every month. I’m nervous to talk to my doctor about the next steps and how I will take it if their are any problems with me. I already feel guilty enough that I can’t give my husband a child on my own. Thank you to anyone who reads this and I appreciate any prayers or words of advice from you guys. You are really the only people I feel comfortable talking about this journey with.