If you are uncomfortable with the "Last Seen" feature, you can easily disable the feature, but you also will not be able to see the "Last Seen" status of other WhatsApp users.
How to Disable "Last Seen" Feature On WhatsApp?
To disable the "Last Seen" feature in the WhatsApp app, please follow the instructions in the following tutorial:
# Go to WhatsApp. Please open WhatsApp first and press the Settings button which is 3 vertical dots on the right
# Settings. Select the "Settings" option.
# Accounts. Select the "Account" option.
# Privacy. Select the "Privacy" option.
# Last Seen. Select the "Last Seen" option, then press the "Nobody" option.
Here's the tutorial "How to Disable the Last Seen Feature On WhatsApp". Hopefully can help for those who need it.