Identify your limiting beliefs.

Find your “shoulds.”
Write "I should..." on one piece of paper, then finish the sentence in five different ways. When you finish, ask yourself, “Why I should do this?” and write the answers. For example, "I need to lose weight because my mother expects me to,”; “I shouldn't go to university because I think I am too stupid,"; "I should get married because everyone should do that,” etc.

Remove "I should" from your vocabulary and replace it with "If I wish, I could."
Go back to your “I should” list and replace it with the phrase, “If I wanted, I could.” For example, "If I wanted to lose weight/get married/go to university," etc. Then consider why you didn't do all you could. Is it because you didn't want to or because you believed you wouldn't be able to? Your responses to these will make you realize that your "shoulds" are mostly people's wishes and expectations.

Recognize the source of your limiting beliefs.
Make a list of everything your parents criticized you for and any flaws or remarks they made about you. What did they say about your personality, physical appearance, romantic relationships, etc.? Take another paper now, and repeat the process for any negative comments made by relatives, friends, teachers, or other authority figures in your life. Once you have the two lists of your limiting beliefs, say to yourself, “So, this is where all my wrong beliefs come from.”

Understand the impact of your beliefs on your life.
Write down your problems, then try to answer the question, "Which of my beliefs created these problems"? For example, if your problem is that you don’t have any friends, it may stem from your belief that ‘nobody loves you.’

Realize your limiting beliefs are not the truth.
Examine your beliefs and consider whether they are a constant truth or learned from childhood. For example, if your teacher once told you that you have difficulty learning new things, ask yourself: Why do I continue to use this belief? Is this the case right now? Do this for each belief on your list.