Why do people even think about future if it, actually, doesn't even exist?

Think about it.
Whenever we talk about future, it is all wild guessing. We may talk about “scientific predictions” and “statistics” and all “mathematical” stuff that may tell us what may happen, and it’s still “may” not “will”. There always is an outcome we do not include, always something we either don’t take into account or simply ignore.

We are really certain about future events only if we have experienced these situations before. We know that touching a hot stove will give you burns because we know it has happened without a fail hundreds of times already. (more on that later.)

But, we can’t predict what will happen in one, ten or a hundred years. We can’t even predict what will happen in the very next minute. Because it never happened. Is has never been a part of our consciousness and our collective memory.

Even when we discuss future in language, it is actually expressing a wish or an intention, not actually future events. “I will go to the doctor’s tomorrow” is actually “I intend to go to the doctor’s tomorrow”. It can also be expressed with present tense anyways, saying “I am going to the doctor’s tomorrow”.

“You will burn if you touch the hot stove” is “I assume you will burn yourself, because that’s what’s happened so far in similar situations”. We exclude the possibility of not burning yourself, because we have never heard of it before.

So, when you look at it like that, can you even say that future exist? If it doesn’t really, why do people cling on it so much? Why is it important what will happen, if any answer is a guess and imagination? Is there any point in even speaking or thinking about future, if it is that feeble and uncertain?