I Lie About Finishing My Morning Run

So this morning, I was running late for work again. But this time it wasn't my alarm's fault or traffic, but the fact that my phone had died over night and I forgot to charge it. By the time I woke up, it was too late for a proper run, so I decided just to jog around the block once and tell everyone at work that I did five miles like usual. I put on my running gear as quick as possible and went out in my front yard, doing one slow loop of my small street. It only took about three minutes, but by the end, I was all sweaty and breathing hard, enough to look legit when I got to work and someone asked how far I ran. When my co-worker John came up with his usual question, 'Hey, man, how’s your run this morning?', I just blurted out five miles. And you know what? He believed me. But now, all day long, every time I see him or one of the other runners on my team, a little voice in my head goes 'You liar.' I've been feeling pretty guilty about it since. I mean, I’m usually an honest person. Plus, if someone actually found out they’d think less of me, wouldn’t they? That's what really gets to me. Every time we talk at work about upcoming races or how long a run is supposed to be before the next competition, that little voice in my head just keeps saying it over and over again, you liar. You know I’ve always wanted people to think of me as an honest runner who can push through tough runs without complaining. But here's the kicker: now I’m worried about the consequences if anyone finds out. What if John, or someone else on the team, figures it out? Could they tell everyone at work? It’s just so small and pointless a lie that it feels really bad to think people might find out about it. I don’t want them thinking less of me for one silly thing like this. And yet I feel so guilty every time I see any of those guys around. So what should I do now, come clean? Admit my little fib and hope no one cares or get away with it? It’s just one small white lie about a run that I haven’t made, but the guilt is killing me.