well i have the solution for you : When you repeat something for long time you make it a reality .And you make this mistake on your subconstient mind and ts implanted there and also the sugestion of your mather that you comport like a 3 year child agravate this problem .You must think the oposite idea and act oposite until you change it from your mind .You see you think almost that you make bad things etc you must think that you are mature serious etc and you will not break anything .You must be perseverent and do it continualy and after a time you will delete this bad habit from your subconstient mind