sos

does anyone of you know how to tell our mind to stop sending signals to the other parts of our body to stop doing things that it knows,  are irrational. it is like, when you know how stupid your doing is, you know that it is immature, and sometimes pointless, but you just cant help it. you know the fact that it should hv stopped since you know it is bad, amd doesnt bring any good to you physically or mentally. but just why the hell are you keep doing it. how to get over it???