Why have I not been able to log into Minecraft for 2 weeks?

I've had a problem for 2 weeks. I accidentally logged out 2 weeks ago and when I tried to log in again it said, ' The email address or password are invalid. '' I have also uninstalled Minecraft. Someone said that I have to wait a while and then it would work again. But it's been 2 weeks and I still can't get in. I also tried to log in with another account (the account is from a friend) but it didn't work either. What do I have to do to be able to log in again? How long does it take? For info it's a Java Edition account that I bought on the Minecraft website.

Did you use mcleaks? (Or something similar?)