My nick was locomacaco and i've been chatting alot these days and just now someone invade my account and change the password, i dont know how they did it.
what account?
if it's steam account you can use steam support and ask for help
they will make sure that you have a screen shooted proof that you are the owner of your account
Did you log in with your real IP address? if yes then they are very easy to take over your account. Next time you should use VPN to access website pages