"I don't get anything out of Mass"

Some sage words from St. Francis de Sales for those who complain they don't get anything out of Mass (Introduction to the Devout Life, Bk 2, Ch. 9). He's speaking of meditation, but it certainly also applied to Mass in spades:

But if, after all this, you are still unrelieved, do not be disturbed at your dryness, however great it be, but continue striving after a devout attitude in God’s Sight. What numbers of courtiers appear a hundred times at court without any hope of a word from their king, but merely to pay their homage and be seen of him. Just so, my daughter, we ought to enter upon mental prayer purely to fulfil our duty and testify our loyalty. If it pleases God’s Divine Majesty to speak to us, and discourse in our hearts by His Holy Inspirations and inward consolations, it is doubtless a great honour, and very sweet to our soul; but if He does not vouchsafe such favours, but makes as though He saw us not,—as though we were not in His Presence,—nevertheless we must not quit it, but on the contrary we must remain calmly and devoutly before Him, and He is certain to accept our patient waiting, and give heed to our assiduity and perseverance; so that another time He will impart to us His consolations, and let us taste all the sweetness of holy meditation. But even were it not so, let us, my child, be satisfied with the privilege of being in His Presence and seen of Him.