I don't know why you can't always make friends. Your mother says you are too picky and like to take everything seriously. If others treat you badly, you will get angry or find fault with others. This kind of thing is normal. According to statistics of sociology and psychology, more than 95% people have had this experience. You can never make friends. Your mother says you are too picky and like to take everything seriously. This is only a superficial reason. Others treat you badly. Don't find fault with others. People are based on the exchange of interests and values. I can't make friends, mainly because I don't share things with others. You always want something from others. Others treat you badly. You don't have to think so much. You can't influence other people's thoughts and behaviors. If you are kind to others, others will be kind to you. This is an exchange of what you have, and you should give more to your friends appropriately. Good luck.