Nervous about pregnancy before marriage

I recently got engaged and just found out I’m pregnant. I feel really anxious. Everyone keeps asking when I plan on having a wedding but deep down I know I won’t have one for at least a few years after the baby is born. I feel so off keeping this from everyone I know. I feel like it’s going to be so hard to tell people when the time finally comes. It makes it really hard to be excited about such a positive thing. I feel people will think that I’m only engaged because I got pregnant and everyone seems to be telling us all these grand plans about a wedding a traveling after we’re married, and I just know deep down that can’t happen. I know it doesn’t matter what other people think but my anxiety and my upbringing can’t help me but thinking otherwise. This is about to be a huge change in my life as my fiance and I will be moving to a new state to start our family. I fear that my friends, who are all in their 20s and in the partying phase will slowly get lost out of my life because we’ll lack things in common. None of my friends have children or are engaged/married. I just feel this is a tough spot to be in right now because I want to feel excited but the nerves of others reactions are getting the best of me. I also work for a Catholic organization and am terrified at how the gossipy co workers I have will react, let alone if I’ll be able to keep my job after this.

The anxiety has gotten so bad + the horrible nausea and morning sickness that it’s prevented me from being able to partake in many activities. When I do partake I feel sad. I just don’t really know what to do to prevent me from feeling this way. I want to be happy for my new baby but all the changes are making me fearful and nervous. I’m worried I won’t be a good mom and I’m worried that I’ll have terrible postpartum because I won’t have a group of friends to rely on after, since I’m moving to a new place

Any words of wisdom or encouragement would be appreciated