Making a lifestyle change takes a lot of time. If you jump in with both feet, it makes it so much harder to keep it going. Just thinking about the list of bad habits that need to be changed is overwhelming. This is a cycle that many get stuck in. It doesn't mean you're incapable of success. It only means you need to slow it down.
There may be people in your life that are able to succeed at things when they jump in with both feet. And watching them succeed may make you feel like it's easier for them and may make you feel discouraged. It's important to focus on YOU and the changes that YOU need to make and how YOU can successfully make the changes you need to make to live healthy. It's important to stop comparing your results to others and stop beating yourself up when you need to take a different approach then so and so.
Make a mental list of your bad habits. Write them down on paper if it helps you. Put it where you can see it daily. Whatever helps remind you of what changes you need to make. Take it slow and conquer one or two at a time. Start with the easy ones. It has been said that will power is a learned behavior, and this is a technique that helps you improve your will power. Maybe one of your bad habits is skipping breakfast. Make it a point to get a healthy breakfast in every day then move on to the next habit. Once you overcome one, move on to the next.
Will power isn't easy for everyone, and not everyone has the same habits they struggle with. Focus on you're own will power struggles and overcome them one by one.
Good luck on kicking bad habits, one by one! And don't move onto the next until you've got the current habit under total control. I hope this helps you with your healthy journey. Every little thing counts!