Commitment is a muscle. The more you use it, the stronger it gets.
You're always a work in progress. Flexibility. Personality. Motivation. There's always room to improve.
Resolve to do the things you find to be difficult. That's what confident people do. They tackle those things that are scary and they get addicted to doing it.
Know how blessed you are to be able to work this hard!
Only exercise on the days you want to improve your mood.
Never measure yourself against magazine covers. Every 'perfect' body you see in a bikini is a result of weeks of dieting and exercise. And airbrushing.