Childhood behaviour. And relationships!

Hey, doctor sometimes i do activities like 12 year child due to childhood behaviour of my brain .i come into original childhood behaviour and do like monkey activities. During my this behaviour of childhood i definately know what i doing but i cant stop my self and i cant control on my mind. These whole activites occur when i generally at home or alone at any place. Sometime friends ask me you are not behave as must according to your age And when iam in the class or meetings or talk with peoples then i talk like a professional,gentleman i get totally changed at that time. Plz doctor i want to get rid from my this childhood behaviour of mind. Because this will rise problem for me in future in jobs and relationships