How can i tell my parents that something is wrong with me?

Put head down /punt: While individual advice cannot be offered here, the best way to reduce anxiety about doing something is to develop a plan to do it, taking enough care for a reasonable chance of success, and then picking a good moment and executing that. If there are very seriosu fears it may not go well, parent-child issues, etc. Consulting with a clinical psychologist for assistance and role-playing may help.