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Shadow shifts

So tonight I was on from 4 until 6. But me being the stupid b I am read the time wrong, and told everyone on poolside I was done and went to the staff changing room. After getting ready I realised the time and felt so bad, so I was straight onto the aquatics organiser for the company and said an issue just came up and told the supervisor on shift that I was meant to say when I came in but forgot. He said it was okay as it’s only my shadow shifts and we have enough working. I feel really bad
Should this play on my mind?