I realize that it may feel weird to you going to Mass alone, but I’ve been going to Mass alone for years and I see dozens of other people at Mass alone every time I go, especially at the daily Mass.
You won’t “stand out” at all, nobody is looking and nobody notices or cares. It’s really normal to be at Mass alone as many of the people who are there alone are single, widowed or have a spouse who is nonpracticing, non-Catholic, or just not well enough to attend.
People are there for Mass, not to keep track who’s there alone and who’s there with a family of five.