The Catechism of the Catholic Church states the following:
1735 Imputability and responsibility for an action can be diminished or even nullified by ignorance, inadvertence, duress, fear, habit, inordinate attachments, and other psychological or social factors. (597)
If you have inadvertently missed Mass, then you have no sin. It is not necessary to confess it. This paragraph would make no sense to tell you that you have to confess something that is not a burden on your conscience.
This paragraph is very vague; you might have a “social” factor or an inordinate attachment that made it impossible for you to attend Mass.
You should recall the universal call to holiness that is addressed to each of us.