I keep messing up my diet plan

I’ve been on a weight loss journey for the last 2-3 years and started tracking my calories a year ago. I’ve tried to be consistent with it but ofc there are days where I don’t track or when I just completely let go of my diet. I want to lose 20 more pounds but I have been struggling the past 2 months.

I try to plan out my meals for the next day in the LoseIt app the night before but when the day comes, I’ll just end up deleting it and not really sticking to it. I find myself losing motivation and having setbacks after setbacks. I feel so discouraged :( I just want to be able to stick to my diet. I know I need to be disciplined and eat what I plan but why does food have this hold over me. I feel frustrated with myself