When you install WhatsApp for the first time your status is set to “Hey there! I am using WhatsApp“, this is what you are probably seeing looking at many of your contacts and what other people who have you in their address book see about you too, you have to change this manually.
To change WhatsApp status and enter a personal message that is not “Hey there! I am using WhatsApp“, you have to access an ongoing conversation first. Once in that screen, click on your Android phone’s Menu button located at the bottom of your phone, represented by three horizontal lines, this is nearly always a physical button (on the left side of the home button).
You will now see a menu on the screen with various options, like the screenshot above, tap the “Status” option to see a new screen that says “Your current status“, that is where “Hey there!…” message goes, edit it tapping on the pencil and enter a custom message, phrase, emojis or select one of WhatsApp premade status messages on the screen, where it says “Busy“, “Available“, “At work“, “At the gym“, “Sleeping“, etc. You can keep changing the status depending on what you do so that other people who see “At the gym” get an approximate idea of when you will be available next, much better than just writing “Busy“.
After changing WhatsApp status it will only be updated on other people’s phone when they turn on data or Wi-fi. To know for sure what is being displayed about you by WhatsApp, ask one of your friends or family members to look at your contact name in their screen and describe you what they see.