Having a family of your own is a pretty good goal to have in your life.
You will never be in a perfect condition or the perfect situation to start a family. Age, money, health, timing, partner. If only two of these are perfect, you’re already doing pretty well.
Living in the past and wanting to be a kid again is impossible. Accept your present, and live your life. Once you have your own kids, you can revisit everything you loved about your childhood with your own children.
Your depression will not end, if you want to be a child forever.