'I'm' is an abbreviation for the word 'I AM.' It is used in combination with other words to tell someone about yourself or to describe something you are doing.
Here are some examples:
I'm so tired.
I'm confused.
I'm happy.
I'm twenty three years old.
I'm hungry.
I'm nervous.
I'm excited.
I'm leaving work.
I'm thirsty.
I'm from Seattle.
You can also add descriptive words with 'I'm' such as: