Mathematics is an enormously powerful cultural achievement that (generally speaking) expands our ability to see the world and to act in the world. Mathematics education is our time-consuming effort to welcome you, the individual, into this culture.
It's not a passive effort, and it doesn't happen all at once. You have to engage with the world of mathematics, and you will do so gradually as you gain the ability to mathematize in the world (the ability to use math in how you see and think about your world).
Take, for example, knowledge of ratios and proportionality. Assuming
you already know some arithmetic, you can learn to read a word problem
so that you place three numbers this way:
And you can use arithmetic to find the missing value. But people who
have an understanding of ratios and proportion don't see this problem the
same way. Those people see a relationship between two quantities
becoming a property or quantity in itself (in mathematics, we call
this an extrinsic property or quantity). In appropriate
situations, this becomes a powerful thing to know. It's related to
rate, and it can be used to think about and compare proportional
situations in many contexts.
It's the difference between being able to follow instructions and just
mix the ingredients of lemonade together so that you get the recipe
right vs. thinking mathematically about how the ingredients come
together to create the flavor of the lemonade.
When your view of the world changes it's as if you can see things that were invisible to you before. And once you can see things, you can make decisions based on them. Imagine being in big room in the dark, and the room is full of big obstacles. You want to move around, but you have to stumble around, feel your way around obstacles slowly, be careful not to trip. You can make progress moving around, but it seems pointless.
Now, turn the lights on. Not only can you see where the obstacles are, but you can see the opposite wall of the room, and doors. You can choose to walk directly toward them -- that's a goal you weren't even aware of before. Seeing the objects in the room didn't just allow you to move around more quickly; you can now move with purpose. There's a point to it.
Here's the most important thing: as the knowledge becomes your own, you are the one who answers the question what is the point of learning this mathematics? Math educators can only help turn the lights on. The rest is really up to you and what you want to do.