The user library has been hidden since Mavericks.
Invisible Users Folder
If you have updated to 10.9.3 you may have discovered that your /Users folder has disappeared from view. It’s unclear if this was intended as a safety precaution to prevent a thief from accessing your account or simply a bug introduced with this version. In any event, it seems the solution is easy:
1. Open iCloud preferences, scroll down to the Find My Mac entry and uncheck the box.
2. Open Terminal in the Utilities folder. Paste the following command line into the
Terminal window.
sudo chflags nohidden /Users
Press RETURN. You will be prompted to enter your admin password. It will not be
echoed to the screen.
In some cases, you may need to restart the computer.
For Sierra activate the Finder and press COMMAND-j keys. You will see:

Check the Show Library Folder box.