Personal affirmation statements can be very helpful to improve your own self-image. They can also act as triggers to help you remember that you are more powerful than you think.
You already have many good qualities that those who know you could list.
The point is, how much do YOU value yourself?
We all have our degree of self-esteem, which also varies depending on many factors such as how tired you are, whether you've eaten well and sufficiently, or the particular chemical configuration in your body at any given time.
Therefore it's normal that at times you'll have a greater degree of self-esteem than at other times.
What you want, however, is to have a large degree of self-esteem most of the time. Life is an amazing adventure, but when we don't feel good with ourselves we're closed to seeing it that way.
Here are some personal affirmation statements that you can use as a base. Remember to read further on affirmations - there's a lot said about whether they work or create more anxiety, or about what's the best format to use (I would recommend you read about how to find the best affirmation wording).
Use the following twist to push yourself forward.
Rather than affirming who or how you are at present, think of some personality trait that you would like to have.
Then, write your own personal positive sentences about that quality as if you already had it.
For example, if you know that you tend to worry about future hypothetical situations, you could say to yourself "I know how to live in a relaxed way", "I am always alright", "I am courageous".
Expand yourself. You've only got to gain!
Some affirmation statements in this line could be:
I am capable of dealing with all circumstances
I overcome difficult times successfully
I deal calmly with any situation
I am self-confident
I am self-reliant
You have the power to give shape to the person that you want to be - by using your thoughts wisely.
"Be yourself; everyone else is already taken."