make a mountain out of a molehill

tehdä kärpäsestä härkänen puhekieltä To treat a problem as greater than it is; to blow something out of proportion; to exaggerate the importance of something trivial

If youre stuck in traffic, try not to make a mountain out of a molehill worrying about it too much. It could be much worse.''

"It is only an old umbrella, isn't it?" she asked.

She wondered why he, who did not usually trouble over trifles, made such a mountain of this molehill.