I was an outfielder in college. One summer ball game we didn’t have a first baseman. I made the mistake of saying I had played some first base in high school. A line shot hit the infield lip and didn’t come up where I expected. I turned around on my knees, puked, got up and continued. I never played first again.
My son played short without a cup from 7th grade through soph year of high school. I told him he was nuts. Or that he could end up wondering where they are.