Good afternoon Ingridamelia,
Welcome to the Apple Support Communities!
It sounds like you are being prompted for a password to access your data on your MacBook Air.
When did you start receiving these prompts? Have you recently updated the macOS on your computer?
Please be sure to have a Time Machine backup in place before troubleshooting issues with data. You may need to erase and reinstall the macOS, but before that, try resetting your user admin password, and repairing the internal hard drive with Disk Utility.
Back up your Mac with Time Machine
Reset your Mac login password - macOS User Guide
How to repair a Mac disk with Disk Utility
If the issue persists, please reply to this thread and we'll do our best to help you!
Take care.