Do I look too childish with my makeup?

I would appreciate your advice!

I met my family for the first time in a while during the holidays, but I was told that I didn't look my age. My aunt asked why I, a grown adult, was wearing makeup like a little kid. She said it without any malice, so I wasn't hurt, but it kept coming back to me on the way home.

I'm wondering if my makeup makes me look younger. I just apply cushion foundation, eyeliner, shimmer for my under-eye area, and lipstick; does that make me look like a child? I don't even wear that much makeup; is it because of my under-eye area?

I want to do a mature and sophisticated makeup look. Where should I start? I would appreciate it if you could leave lots of comments!!