I remember feeling that way about other couples in the beginning. Something that I've learned a lot about while being here is that we've ALL been through something. Being on this side of this particular fence has opened my eyes to the fact that there are MANY situational fences that I wasn't even aware of in the first place. It's helped me to push down the envy that someone else's life looks easier or better than mine. It's also helped me let go of some judgment. Side bonus.
It's normal for you to feel unsure. It's not a comfortable place, but it's not permanent either. You don't have to have answers right now. Just breathe, take care of yourself, and make small steps when you feel ready.