Logging into account

I am having trouble logging into my account, I am on the loading screen I type my username and password in correctly and it says incorrect password or username. I found this weird considering how I typed it in correctly. My friend suspects its either a glitch, hacked, or I got banned. I personally think it was just the glitch or hack. If you could help me out with info that could help me that would be very very much appreciated cause this is my main account and if I lost it, I would go insane. Thank You for the support!