The Catechism of the Catholic Church states:
[color=green:1f699a73]1457 According to the Church’s command, “after having attained the age of discretion, each of the faithful is bound by an obligation faithfully to confess serious sins at least once a year.” Anyone who is aware of having committed a mortal sin must not receive Holy Communion, even if he experiences deep contrition, without having first received sacramental absolution, unless he has a grave reason for receiving Communion and there is no possibility of going to confession. Children must go to the sacrament of Penance before receiving Holy Communion for the first time.[/color:1f699a73]
Have you made your first Communion and Confession yet?
Remember, keep going to Mass! The Eucharist will help prevent future mortal sins!