When we attend Mass, we so often forget that it is a meeting place of Heaven and Earth. We do not see the heavenly host of angels and saints who surround the altar at Mass, or who fill the Church with their joyous songs of praise.
One way we can help ourselves remember this fact is by asking our Guardian Angel to accompany us to Holy Communion, as they can further prepare our hearts to receive Jesus into our hearts.
Here is a short prayer from the devotional The Glories of the Catholic Church.
O my good angel, it is your Lord, as well as mine, that I am going to receive; help me to receive Him worthily.
How guardian angels can soften an obstinate heart
Prayer to your Guardian Angel for good health while traveling