When I was about 13 I was waiting at the bottom of my cousin's road on the way to school, because usually I met him there and we walked to school together. Then a small, white car pulled up on the curb beside me, what looked just like my granddad's, and sometimes he did unexpectedly come along in his car and offer to take us to school. So without thinking I got into the back and got myself comfortable, only to look up and see it was a man who wasn't my granddad at all. Luckily he was quite a friendly, jolly man, and he said, ''you're in the wrong car, mate!'' Feeling incredibly stupid I said ''oh, sorry'', and quickly got out. After that I felt so embarrassed for some reason, and it seemed to haunt me for the rest of the day.
A similar thing happened a couple of weeks ago when I was getting on the bus with my mum. She got on before me, but I wasn't really concentrating because I was reading a bus timetable I had in my hands as I was getting on the bus, and as I was walking up the aisle I just followed the woman in front of me who I thought was my mum (she was wearing the same trousers as my mum, what I could see in my periphery as I was still looking at the bus timetable). The woman sat down a few seats from the front, and I automatically sat next to her and put my bags down by the seat, and I was just about to say something, when I looked up and realised it wasn't my mum. I felt silly once again, so I said ''oh....I thought you was my mum'', and I looked around quickly and saw my mum sitting nearer to the back, and I quickly got my bags and dashed over to sit next to my mum. We did laugh, and I didn't feel that embarrassed because I'm older now and I know that everyone makes mistakes. 
_________________
Female