Question:
Answer:
Personally repenting to a person we’ve sinned against is good and important, but that action does not absolve us of our sins. In addition, it depends on whether your sin is venial or mortal.
Reception of the Eucharist in a state of grace absolves us from venial sins (CCC 1394). In addition, we need not mention each and every venial sin in confession, but it’s helpful to inform a priest about those which are common, because he can offer counsel in combatting them (see CCC 1458).
In contrast, mortal sins need to be confessed in kind (type) and number, i.e., specifying the number of times we’ve committed a particular mortal sin.
And, yes, if you are truly repentant, your absolution is not contingent on whether or not the person you’ve offended forgives you.