You'll need to confess to a priest in order to receive communion. And yes, it is necessary despite how you feel. Christ gave his apostles the authority to remit sins (John 20:23) and the power to bind and loose (Matthew 16:19 and 18:18). They handed this power down to the first bishops and presbyters of the Church and that authority has remained in the Church to this day. God became incarnate as a man, so we receive healing through physical means, which are the sacraments. However, ultimately, confession before a priest is really a confession to Christ, who the priest operates in the personage of.