here in my location we call reacting and feeling like a child when under stress to be normal and there is a therapy approach around this issue called inner child therapy. to do it one holds a picture or other wise meaningful object that shows how one was as a child. the adult is asked to look at the picture or the object and .....imagine...that child is in the room, now imagine what you would like to tell that child you once were. then close your eyes and imagine doing and saying those things to the child you were. whats the point this activity usually helps a person to not react like a child under stress because they are better at understanding why they reacted that way and now have better coping tools.

that said there are some mental disorders that involve things like throwing temper tantrums, road raging and such. your treatment provider will be able to set up diagnostic evaluations that can tell you whether you have any mental or physical health problems that are making you react like a child when angry or upset or under stress. we can not make that diagnosis here.