How to overcome my fear of driving on highways?

I thought this fear was gone but recently I brought my sister to the movie theater and the route took me onto a highway it wasn't a crazy highway but still one. I was really nervous and during the movie, I was freaking out about going back and was looking up routes on avoiding the highway back home. I'm 20 and this isn't normal and I am getting a new job that might include a highway to the job site.

How to overcome my fear of driving on highways?
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