Is this feeling normal?

So my son is 11 months old. He is my only child and I remember being that pregnant with him and going in to labor and delivering him was the most exciting time of my life! Well now my friend is in labor, fixing to have her first. I’m SO overly excited for her but can’t help but to feel jealousy, like I achingly miss those feelings I had when I was in her position and I know I’ll never get that time back with my son. I’m honestly so emotional over it. Is this normal?