School psychologist/counselor speaking here: You can actually do this! You can visualize yourself speaking to a younger version of yourself! If you spend enough time visualizing the interaction, the setting, the clothing, the mood.. you will be surprised how vivid the interaction becomes. You will discover more about yourself. You will be able to sense what the past you needed to hear. Try it!
(Didn't know where else to put this, I hope it belongs here!)