TTC but don't know what to do.

Been TTC for like 2 months. I know that's not long but I'm getting so disappointed already because everyone around me is getting pregnant and having kids without trying and here I am trying to have a baby and can't even get pregnant. It's just so upsetting. I have wanted a baby since I got married and was 18. Glad I didn't get pregnant by my ex husband. But now I am engaged to get married. We have our own house and now we want a baby but it seems like it will never happen. We have been having unprotected sex for like 6 months now. Weren't trying that long. But weren't trying to prevent it either. Going to buy prenatal vitamins tomorrow.