@estudiante13 You can start the process of recovering the account here:
https://steemworld.org/account-recovery

Start it as soon as possible, if the abuser have your active key, they can power down and steal all your money. If they have only posting key, they will be sharing spam with the link to the website that is stealing the passwords and most likely you will be banned in most of the communities soon.

When you will recover your password successfuly, write the post about it and mark me.