Its not compromised Id never elt anybody use my MC account its because when I played cubecreaft my points went up a lot and idk how I did nothing to it!You should change your Minecraft password immediately otherwise contact Mojang so they can help you get back your account. As @LucianYOLO said, if it is a compromised account, it would be banned.
Yes, it bans you for you safety.Since someone else has managed to get into your account, it will be deemed as compromised at it is not the account stealers.