To ask for what you want 6. To experience and express your feelings 7. To feel positive about yourself under any conditions 8. To own your own opinions and convictions 11. They usually know how they feel about things and are willing to express those feelings without feeling guilty.
Some nonassertive people act like they want to apologize for using other people's air.
Come on folks, the world was created for you too. Assertive people have good eye contact and body language because they know that their opinions are important and worth considering even if no else in the whole world thinks so. They don't necessarily express their opinion to try to change anyone and they are comfortable when someone disagrees with them. Hopefully your self worth is not dependent on having everyone think as you do. But often we act as if that were the case.