Help? My email won’t let me log in, but all the information I’m giving is correct?

Hi, I tried to log into my second email account to find out that it wasn't working. I only have one email under it which is the one i was trying to logg into, the password hasn't been changed as well. My instagram, facebook and twitter is under that account and I have alot of friends/followers. The phone number I have gave to the account no longer exists as I have a new and never got around to updating it. I wasn't informed that outlook was updated so What can I do? Help please :(?