Lesson learned

I need to learn about diet and exercise.  I don't feel good about myself.  I would like to overcome eating too much processed foods.  My question is, how do I go about doing that?  I feel like being ashamed of myself because I want to be honest yet it has been hard.  I really have to log in everything I eat.  I have to and need to be honest with myself if I wish to lose weight and take care of myself.