Actually do it.
Each step is a step closer to your goal.
No matter how small your effort it will reward you. In time you can increase your effort and the rewards will come. Your weight will start to drop off. You will shed the body clutter. A new you will slowly emerge. That new you can be a turning point for other dreams.
Commit to be stronger than stress, stronger than relaxing, stronger than too tired, stronger than not worth it.
When the goal seems too big just remember life can change. Even small changes are still worthwhile changes. Nobody wakes up suddenly overweight. Just as it crept on quietly you can undo it one day, one step at a time. Time is funny thing that way. Time will pass no matter what you choose. Choose to greet the rest of your life fitter and healthier.