Compulsive eating and exercise

I wonder if I exercise then I won't each as much.  Here is what I am trying to write: I eat less, then I exercise more.  If I eat healthier then I exercise more, then all will be well.  Simple as that, no?  Not if one has the issue that I have.  I believe that I can get the help that I need.  I would like to get the help that I need.  I just believe that with diet and exercise all will be possible.  But if I eat compulsively or out of impulse, what good will exercise do?  I guess nothing.  I need help.  I have no idea what I am doing.