Rest from exercise today

Today, I am at rest.  Tomorrow I will walk or do some other exercise.  However that is a post for tomorrow.  I went to my appointment and I wish losing weight wasn't so hard, even with diet and exercise. Maybe my approach to losing weight is all wrong.  Maybe it is just my thinking.  I have been feeling discouraged because I have gained weight...again.  I plan to lose 100 lbs and I thought that with exercise added losing weight would be so easy.  It isn't.  Maybe my "diet" has been wrong all along.  All I know is that I need some encouragement.