Calculus is one of the core achievements of mathematical theory in the last 500 years. The massive majority of modern physics, chemistry, ecology and even economics is based on the techniques developed in calculus.
Not surprisingly then, almost any degree you take in university will have a mathematical component – any form of analysis of the world will have some models involved – models based on the concepts of calculus.
Everyone recognises the importance of calculus – even if they don’t understand it. If you look at the cartoon at the top of this post, you will see something that appears to be maths; look a little closer and you will see it gibberish. Many people are mathphobic – they say things like “I can’t do maths”. Unfortunately, that line is not available to you, so you’d better get into it!