It is both a celebration and a sacrifice. On the first level, it is a celebration of a sacrifice because we commemorate Calvary. On the second level, because Christ’s sacrifice is once and for all, we re-present it - ie, make it present again - at the Eucharist. It is not that we sacrifice Him again (because he has already given Himself in sacrifice) but rather we take part in what is a once-and-for-all-time event.
As far as the tone of worship, see what Revelation 4 and 5 say about the worship at the altar in Heaven. This is certainly more somber and formal than contemporary Christian music would have - and while there’s a time and a place for music like “Mercy Me” it doesn’t have to be during a liturgy. That said, I think some are called to charismatic worship - perhaps yourself - and there’s nothing wrong with more upbeat celebrations like the Life Teen masses. But don’t dismiss a Missal celebration because it is reserved and solemn.
Lastly, if your soul calls out for joy, then be joyous. We ought to worship throughout our lives. If the Mass is the most solemn moment of your Christ-filled week, truly the Lord has blessed you with a spirit of joy!