Get off my case
Definition 1 of 1
Pro Tip 1/3Informal
Use it with friends or in casual settings, not in formal situations like job interviews. 
If my roommate asks again, I'll say, 'Could you get off my case? I'll clean up later.'
Pro Tip 2/3Frustration
Shows irritation or exasperation with the person's continued attention or nagging. 
After my brother's third reminder, I snapped, 'Get off my case! I heard you the first time.'
Pro Tip 3/3Seeking Autonomy
Implies a desire to make decisions without others' interference or guidance. 
She told her friend, 'I'll handle my problems, so just get off my case, please.'