You lose control over you mind because of the presence of too many desires. Desires force the mind to find fulfilment in the external world.
Every person attributes his suffering to outside forces and external situations. Very rarely indeed does one admit the problem lies within.
Use your intellect to guide the mind, senses and body to the ultimate destination.
When your mind is agitated you cannot think properly. If you cannot think properly you cannot act effectively. It is a law of life.