You wake up one morning with amnesia, only to find out that you are the reincarnation of a powerful demon lord. How do you react?

Your memories stop at the day of your death 150 years ago. You were an evil demon lord that ruled your kingdom with an iron fist, and was killed by the strongest hero in the land. You don't remember much else about your life before death. When you wake up, you find yourself in the body of a child that looks about 10 years old. You also notice that you have full sized horns on your head, and some sharp looking teeth. You can't see yourself, but you can tell by the looks on peoples faces that you don't look normal. A young girl that says shes your maid is feeding you food. You know that you're not supposed to know how to talk at your age, so you pretend you can't. You also notice that your body seems very weak compared to your old one. What do you do? (If I missed any details, ask and I'll tell you.)