What's the biggest mistake you've ever made?

I feel that the biggest mistake I have ever made is to run away from home in an unfamiliar place.

It happened during the summer vacation of my second year in high school. When I had nothing to do, I went to play with my eldest sister in Suzhou. At that time, my sister was just an ordinary worker in the factory. When I went to her place, we slept together. In order to take me to Suzhou, she took a few days off. Although my sister didn’t have much money, she spent some of her hard-earned living expenses to take me out for fun.

I remember one night my sister and I made an agreement to go to Yishan Lake. At that time, she suddenly told me that the results of our final exam came out. Before my sister said this, my mobile phone I just threw it away, and then she logged into my QQ with her mobile phone and saw the scores sent to me by my classmates. I knew very well that I did very poorly in this final exam. So I really don’t want my sister to see the score. Then I wanted to use her mobile phone to log in to my QQ. Just when we were about to set off, she said she didn't bring her wallet, so she held her phone to me and said she would go upstairs to get her wallet. I immediately turned on her phone and it rang, asking to log in to QQ, but she had set a password on the phone. , I didn’t know at all, so I tried again and again. As a result, the phone got locked after trying it several times and could not be opened anymore. The phone she bought at that time was a Meizu phone. The person who repaired the phone finally said that the phone had a double-ring lock. When my sister came back and found that her phone was locked, she was very angry. She went upstairs with her phone and even said something to me. I was very angry at the time and felt that it was unfair that she had peeked at my scores and was scolding me now, so I took a shower early and went out wearing slippers. She didn't know at all at the time. Late at night, I had no idea where to go, because I was a road nut and couldn't figure out many directions. So I found a grassy area with no people, and found a bench next to it. I lay on the bench and cried. Late at night, the haystack was full of mosquitoes. They bit me so much that I wanted to go back, but in the end I didn't know how long I had been lying on the chair, and my sister came to find me. She held her cell phone and kept calling my name, but I didn't respond and just cried silently. Until she was too tired and went home with her cell phone, I followed him silently. Not long after she returned to the dormitory, I arrived immediately. She sat on the bed without saying a word, took off her slippers, and I looked at her bleeding feet. There were other roommates in the dormitory, and we didn't say anything. We just lay on the quilt and cried bitterly. When I went to play with my sister the day before yesterday, I heard her say that the slippers did not fit my feet. Now she has blood blisters on both of her feet just to look for me. At that time, I followed her and watched her squatting helplessly on the side of the road crying, wiping her tears and calling my name. I don't know why I ignored her so cruelly?

I feel that this is what I did, a huge mistake, and I feel particularly sorry for her.