Mass is also a “communal” worship, with fellow Christians. When we are with fellow Christians, we are able to exercise our spiritual gifts–exhortation, helps, giving, etc. You will receive the benefit of these spiritual gifts, and you will be able to exercise your spiritual gifts and be a benefit to others.
It is encouraging to fellow Christians to be together and participate together in confessing sins (done during Mass), singing, prayer, silence, reading and hearing the Word of God, and joining in Holy Communion, if not by receiving, then by making a spiritual communion.
The liturgical Mass prayers of your fellow Christians during Mass are edifying for you, and your joining in with those liturgical prayers is edifying for them. Mass is actually a prayer, and it’s good for Christians to join in with that prayer.
When we attend Mass, we take a public stand for Jesus Christ and His Church and we make a public, visible testimony that we are attempting to follow Jesus. This is important. The First Century Christians, as well as many present-day Christians, were/are willing to die for their faith.
Finally, we will hopefully spend all eternity with our fellow Christians. May as well start enjoying each other now!