[2020] I cant move, no matter what world I pick, no matter what gamemode, no matter what character. not if singleplayer nor multiplayer. I just cant do anything except shoot/swing or chat. cant even use my menu. any explanations or fixes?

Try running the game as admin. :)

Right click the game in your Steam Library.
Go to Properties then the Local Files tab.
Click Browse Local Files.
Locate the game executable (the application).
Right click it and go to Properties.
Click the Compatibility tab.
Check the Run this program as an administrator box.
Click Apply.