Make a mountain out of a molehill

to make a slight difficulty seem like a serious problem

از كاهي كوهي ساختن

Example:Don't let such a trivial thing bother you so much. You're just making a mountain out of a molehill

اجازه ندهيد يه چيز جزئي اينقدرزياد شما را بيازارد .شما تنها داريد از كاه كوهي ميسازيد