. Assertive communication will help you express yourself clearly and maintain self-respect; it can help you feel more positive about yourself and your abilities, also. This style of communication can even aid you in your own self-perception, because you are outwardly describing your thoughts and expressing how you feel. Finally, it can help other people understand you better, because you aren't keeping them in the dark and leaving them to guess about what you are thinking or feeling. If someone is underestimating you, being assertive is a great way to stop her in her tracks. Here are some tips for more assertive communication:  Use "I" statements. This is a great way to put your feelings out there without blaming anyone else. For example, you can say, "I think I'm perfectly capable of dealing with these new job responsibilities" rather than, "You're wrong about my capabilities." This strikes a great balance between expressing yourself while not being too grating or confrontational. Rehearse what you want to say beforehand. Practice will make you more confident in your communications, because you know you've prepared for the situation. Try your new skills on a small scale first. Avoid immediately going to your boss and telling him how you feel. Try being assertive with your friends, family, and peers, when it's appropriate. Although you shouldn't always listen to people who underestimate you, it may be useful to hear them out when it comes to their criticisms. You may be able to use their criticism constructively, whether it's intended that way or not. If you can avoid letting the criticism injure your self-esteem, it can end up motivating you and being a valuable source of information.  For example, you can say "I hear what you're saying. Why do you think I'm not capable of doing well in this job position? I'd like to hear your views so I can improve." This strategy is best for people who underestimate you but aren't trying to be mean to you, such as in cases where your boss might question whether you're...

TL;DR in Indonesian:
Bersikaplah asertif Tanyakan alasannya. Berlatihlah bernapas dalam-dalam. Buktikan melalui tindakan. Jangan menanggapi perilaku kasar.