Three years ago I was a different person
Looking back at pictures from when my kids were born, I was skinny, had hair on top of my head, and went out every weekend. Now I'm 40 pounds heavier, completely bald (which honestly I'm cool with), and my idea of a good night is getting the kids to bed by 8:30 so I can watch TV in peace. I don't miss the going out part but man do I miss feeling like I had my stuff together. Life just hits different when you're responsible for tiny humans.
Looking at my old photos is like looking at a different person. In three years I went from that guy to this guy who can't remember if he showered this week. Embrace it though, the trade off is worth it.