You remember faces if you try. Key word: if.
You got about half to two-thirds right. Your facial memory is... functional. You recognize your friends (usually), you can pick someone out of a lineup (sometimes), and you remember faces from movies (if you watched the movie recently). You're in the normal range. Your brain stores faces but it doesn't prioritize them. You'll remember someone if they made an impression, but casual encounters? Gone. The barista who's served you every day for a year? Never seen that person before in your life.
Get your read — free on iPhoneyou remember faces when they matter to you. which says more about who matters to you than you'd like to admit.