Is it wrong to be bitter?

I’ve been ttc 21 months, I just turned 25. Everywhere I look there seem to be pregnancy and birth announcements and the hardest part is that all of them say they either weren’t trying at all or only tried a couple of months. Very few people in our life know how long we have been trying, mostly because I don’t want to have to keep hearing “you’re still young” or “it will happen when the time is right” etc etc. I just feel like I was never prepared for how to handle this and I don’t know how to talk to anyone about it because no one in my life has experienced it. Has anyone else felt like this? I really just don’t want to be alone with these thoughts anymore.