When your mother invades your privacy, first of all, she loves you. This should be understood correctly. Secondly, your privacy is also very important. You can talk to your mother. You can tell her that I am a big boy. Would you please respect me? Although her behavior is wrong, you should tell her calmly, don't make a hullabaloo about, it will hurt the people who love you.
Everyone has the right to privacy. It is wrong for your mother to invade your privacy. You can reason with your mother and make her respect you. However, it is an urgent mood for mothers to look after their children's privacy out of love, to know what their children are thinking and to help them. For children, she should also communicate with her parents more to reassure them.