In every race, someone has to finish last.
It’s not a huge, unspeakable embarrassment. In fact, no one cares. Not one of the other runners remembers who finished last. All your friends and family remember is that you said you’d run a 5K and you did it!!!
A couple of days after you finish your first 5K, with your aching legs feeling better, you’ll lace up your sneakers and go for a run.
Because you are a runner. And, fast or slow, runners run.