Hi SgtVin522
welcome to the Apple (user-to-user) Community.
Re: "My Mac wifi doesn't connect automatically .... used to automatically connect.
I must manually enter my WiFi password "
Wondering if your MacBook Pro model (year) has the newest compatible operating system installed:
(If you wish: Identify your MacBook Pro model - Apple Support lists the newest compatible OS versions
Apple Support has articles online (links below) that may help:
How to: Troubleshoot joining a Wi-Fi network on Mac - Apple Support
Check VPN (Virtual Private Network) and third-party software to help resolve network connectivity issues - Apple Support
What to do: If you can’t connect to a Wi-Fi network on Mac - Apple Support
Or
You may need to update the router firmware, restart the router, and check with the ISP.
If needed:
MacBook Pro Support website (info. / support / contact)
MacBook Pro - Official Apple Support
All the best :-)