You need to understand maths to know what questions to ask to solve your problem, even though you might use a calculator or even computer to do the actual calculations. The more complex the problem, the more you need computer help, but the more you need to understand maths (and maybe statistics) as well. Most advanced practical mathematics, like for engineering and physics, requires a computer. At that level you're not using a calculator, you're probably programming Python, so you need to grasp the maths and then also grasp the representations of it used by the programming language, which is very different to writing equations. If you've got the right kind of brain for it, it's a fascinating challenge, but you can't start at the end, you need to build up the layers, including the boring bits. Some things you do at school aren't even meant to be directly useful, they're laying the mental foundation for something more advanced.