Hi
Before you log out of your computer, go to "Microsoft Account Sign In" online, and make sure you can log into your Microsoft account.
Sign in to your Microsoft account
It will require the email address that you used to set it up, probably the email address you use every day, and your password.
If you don't know your password it will give you a way to reset it through the email that your used to set it up.
If it tells you that you don't have a Microsoft Account then you can create one and use that to log in.
Once you are
Sure That You Can Sign In to your Microsoft account, "Do it twice to be sure".
Then you can shut down your computer, and use your Microsoft Account to log back into it.
You will have to input your email address in the top line and your password under it.
Whatever you do, don't log out without knowing how to log back in.
I can't believe that your never shut down your computer even once.
You should create a system backup of your C:\ dive just in case it freezes up and won't boot someday.
It does happen, it's happened to me recently.
Mike