I'm not sure what a "mortal sin" is. Is that the same as "unforgivable"? I sure hope not, else I'm in a whale of a fix :)
No, mortal sin can be absolved. Mortal sin is a sin that concerns a grave matter and is committed intentionally. The traditional list of cardinal mortal sins are Pride, Envy, Wrath, Sloth, Lust, Avarice, Gluttony. The other kind is venial, that is a sin done without intending to sin. Venial sins do not have to be formally absolved at confession.
Me, too.