Never stop running 5k race

Today I raced the 5k never stop running. My goal for this race was to run 22:30 or faster. I ran 22:32 so not so bad. However, throughout the race I felt that I was going way faster, I thought that I was running 21:Xx pace, so when I saw the finishing clock, I was kind of surprised. I Will give more details later. My brother ran 24:12.