Haribo, I so feel for you. My family tried to be so supportive the entire time I TTCed and went through all those fertility treatments. They would always say "It will happen!" And I would say "How the heck do YOU know!" I think we have to trust that it will happen, but it is certainly okay to allow yourself moments to be discouraged along the way.
My biggest thing was when people would tell me to just adopt! Well, I didn't want to adopt and people would look at me in disgust and say "Why, those kids need love too!" Well do you think there are just tons of newborn babies sitting around waiting to find homes? It's a very expensive, long and invasive procedure and there is no guarantee that you end up with a baby. People just don't understand the need to experience pregnancy and at least try everything possible to have biological children.
There is also a lot of misconception about IVF. First, I have found it seems to be a controversial topic. Some people think it is evil, while others think it is the cure all for all infertility. Yes, it worked for me, but there are usually tons of steps that could result in a BFP before doing something so drastic.
So never apologize for sounding negative, that is what this board is for -- venting our emotions whether they are good or bad. I think also if you can find a IRL support group, like a fertility yoga group or something like that, it really helps to meet people in the same boat.
I think it is totally understandable that you find your sister's pregnancy difficult. Even though my SIL and brother struggled with their first pregnancy, I was worried they would have a third baby while I was still TTC for my first. It was reassuring to know that their second came pretty easily though. But OH and I did have a few disagreements over the summer where I didn't want to visit a friend who had a baby in May. She TTCed and had a baby in less than a year, meanwhile I was having failed IUI after failed IUI.
I wish there was something I could say to make it all magically okay, but just know that you can vent here and it is okay to feel the things you are feeling.
How is everyone else doing? It sure gets quiet in here and I am going to try and make an effort to log on more. It's impossible for me to write on here at work because I work in an open space and there are always people who come up behind me. (I'm home sick today, so I'm BnBing my heart out.)
Lately, in the evenings I have been so tired I just want to go to bed as soon as I get home! Miss you all!