ME (WHY)

Why is it so hard to lose weight?  Why is it when you do so good you fall off the wagon and eat candy or fast food?  Why do I always want to know why?  Well I have still been struggling with dieting and losing weight.  I try so hard and fail every time.  I love food and want to enjoy it.  I do not have a lot of money to buy diet food after all I have 3 kids.However  I try.  I got some grapes last night at the store they had them on sale.  Pretty bad when you have to look for grapes on sale. I was looking for strawberries but did not find any.  I do not like frozen fruits unless they are in a smoothie.  So what can I do.  I am over 300 pounds and tired of being fat. I want to be in the spot light. Can anyone help me with my struggle?