I finally got logged into Netflix. What I did was enter my sisters username and password. When I did that, an error popped up and said wrong username or password. She didn't have Netflix anymore so I figured it wouldn't hurt to see what happened. I'm not sure if it was the email or password but after this error happened, I entered in my username and password and it logged me in.
I don't know if I would have entered in a wrong password with my own username if it would have given me the same error or not, but if this happens again, I will try that first.
Since it seems like this issue is weird and what works for some doesn't work for all, I wanted to let everyone know what worked for me just in case it might help them.