I am the oldest in my family, I have always helped with my brother and younger cousins. I also babysat a lot for my neighbor growing up. I love kids/babies. Very comfortable with just about any child. Most parents have told me, "wow, my kid don't like anyone, I'm so shocked they just went to you so easily" and that it very normal.
I'm currently watching a friends 3-year-old little boy. I help with daycare pick up and drop off, meals, cleaning, and taking him to different activities to keep him active!