1- Trying To Please Everyone.
You're never going to make every single person in your life happy. So stop trying. Focus on trying to please yourself first and then help others do the same.
2- Fearing Change.
Being afraid of the unknown is very common. We are naturally resistant to change. However, change is also very necessary for growth. Don't be afraid of things changing in your life. You never know what doors might open.
3- Living In The Past.
To get over the past, you first have to accept that the past is over. No matter how many times you revisit it, analyze it, regret it, or sweat it...it's over. It can't hurt you no more.
4- Putting Yourself Down.
Turn down the volume of your negative inner voice and create a nurturing inner voice to take it's place. When you make a mistake, forgive yourself, learn from it and move on instead of obsessing about it. Equally important, don't allow anyone else to dwell on your mistakes or shortcomings or to expect perfection from you.
Thinking too much leads to paralysis by analysis. It's important to think things through, But many use thinking as a means of avoiding action.