Cant join any servers.

When I try to join it says “This account has been used to log into another computer. Please log in and try again” So I click the login button, but when I rejoin it says it again. I’ve tried restarting steam and my computer. Help?

This is pretty urgent can anyone help?

Change your steam password, someone might be trying to get into your account.

Above is True,
but you may have steam open in another comp