I can not log in

Hello.

A few days ago I had a problem, I couldn't log in into my account. It says that my password or email are invalid but I am sure that I wrote them correct. I changed my password to see if it would work but it didn't. Already read a lot of articles about similar problem and at the mojang support website but none of them helped me.
Edit: I sended my account email and password to a friend and when he tested it, it worked normaly, but I can log in with my pc on any account.

 

I hope that you can help me

Thanks you