i was at a Mass attended almost entirely by Latinos the other night, and I would say 60 percent of them did not go to Communion. I don’t know whether it was because they were in mortal sin, or had already received twice at earlier Masses (it was a big feast day and there were six Masses in a row), or weren’t regularly practicing Catholics and just came by for the feast day celebration, but they were all participating in the Mass despite many of them not going to Communion.
As someone said, you still get grace from the Mass even if you are not able to receive Communion.
Also, since it’s a sin to miss Sunday Mass, you would basically be compounding one serious sin with yet another sin if you skipped it.
I would suggest checking to see if there is a church available that has confessions immediately before, or even during, the Sunday Mass, as some of them offer this, and I have taken advantage of it a couple of times.