I told her to be my sister. He said I don't understand. What does elder sister mean?

I can see that you are simple. First of all, whether you study hard as a student is very important. Moreover, if you can't solve the problem because you have been speculating in your mind, it will also affect your mood. It's no use speculating about love. If you want to know the answer, you can bravely tell her how you feel about her and ask her if she likes you. If you want to further develop with her, you can also ask her if she would like to be your girlfriend. If you are shy, you can find a girl who used to have a little friendship with you to help you find it. Ask a girl and let the same sex speak out. I am a girl, too. I can see that it's no fun for her to let you call her sister. These words are all jokes. Of course, you are tempted, so you will feel uneasy about some words in her casual sentence, for example, she said that her sister would feel distressed. As for you wanting to find her, I don't think you should be so impulsive. I mind if you find a friend to know the news first, or apply for another QQ to chat with her as a netizen and ask her some questions you want to know. Simple children hope you can be happy and won't be hurt again ~!