A lot of people who eat junk food regularly may get 30g or less/day. The RDA is 50g/day for a woman, that doesn't change much even with weight training or pregnancy. Men are slightly higher, again doesn't change much even with weight training. In fact, prior to the 1980s, weight lifters didn't eat a lot of protein, they ate a heavy carb diet with little fat/protein. It wasn't until supplement companies and weight lifting magazines associated with those supplement companies came on the market that higher protein meals became a 'thing'. Protein deficiency isn't a thing in the US fortunately even with people eating foods devoid of it. It isn't something you should stress too much about.
You can't out-exercise poor eating habits.