If you see me, I see you. If you move, then I'll move too. When you touch me, I touch you. I do everything you do except for one thing. No matter how hard I try, I can never speak. What am I?

“A shadow”

A shadow can follow your movements and mimic your shape, but it doesn't have a physical presence that interacts with you in the same way a reflection does. Additionally, shadows can change shape based on the light source.

“A mirror”

While a mirror does show your reflection, it is not the reflection itself. The riddle describes the interaction between the reflection and the person, which implies a more direct relationship than simply being an object.

“An echo”

An echo can mimic sounds but does not visually reflect your image or movements. It also does not physically touch or interact in a manner described in the riddle.