Before I got "sworn in" to the Catholic Church, I didn't know what to do with myself when everyone else went up for Communion. I found that reciting the prayer for Spiritual Communion was very beneficial.
Then once I became officially Catholic, I wanted to participate as fully and completely with Jesus in the Eucharist as possible. My patron saint is St. Padre Pio and I discovered his Prayer for After Communion. What a blessing!! I strongly encourage everyone--born Catholic, cradle Catholic, Convert, Revert--to pray this after Communion. Try it for 30 days, see what a difference it makes.