How can I know that I am adopted?

My parents always make me feel bad. My whole life they are stealing my energy. They always upset me and they always expect me to apologize. My character is never like them. People who spend most of their time together are usually similar to each other. But I'm not like them. I can never be like them. Perhaps the children may have been blend during childbirth. I don't want to admit that my family is my real family. My sister treats me badly, my brother treats me badly, my parents treat me badly. because I don't look like them. My family is the angelic-looking devil. I can't stand this family anymore. I'm drowning. My family can't be my real family... I need to take a DNA test.
There is a teacher at my old school that I love more than I've ever loved in my life, and he really looked a lot like me. I wish your teacher was my real father. He was really very interested in me and was a wonderful person.
How can I know that I am adopted?
How can I know that I am adopted?
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