I cant login

Hey, 

 

I have been playing Minecraft for a long time and recently I have been unable to log in to my account. When I enter the data in the Minecraft Launcher, it says that the email and password are invalid. After that I went to minecraft.net and checked if I can login. I was able to log in and downloaded Minecraft again, but it keeps saying that the email and password are invalid.

Can anyone help me, do not know what I should do more. Would be really grateful.

 

Best regards Tom