Totally agree with the conflict-avoidance answer. A small reframing: making mistakes is perfectly normal. A lie is usually an attempt to skip owning one.

What makes you a mature person is:

• Acknowledge it to yourself: nobody is perfect.
• Plan the recovery: there’s a fix for everything but death. An honest apology is often most of it.
• Own the fix: you dropped the bricks, so you pick them up. Don’t wait for someone else to do it.
• Learn from it: making a mistake is fine, repeating it isn’t.

A lie turns one mistake into two, and the second one is harder to undo.