Ok, I think I understand what you are asking.
Energy is infinite. So, no we can not as individuals manipulate most, or all, energy.
We have an infinite number of choices. It is never just "do, or do not". You can choose how you do something. Do you put extra effort into it or do you put less effort? Do you rush it or take your time. Is it something you are skilled at, or is it your first time. Do you prepare beforehand, or is it on the fly? There are many many outcomes.
Here is the problem with making fiction and science fiction possible: Energy follows thought, word and movement. So you can, through thought, word and movement, shape energy. But so can every other person. So can animals. So can plants. In fact, what is consciousness? The occult theory that I ascribe to (and notice everyone I said THEORY) is that consciousness exists in every particle, every atom and every subatomic particle. When this consciousness aligns with correct intention, it creates things. Rocks, trees, animals, people, planets, stars, the universe. Everything. So, therefore, has consciousness and intention. Everything has movement. The continents move, the Earth, planets and stars move. So, if you want to make fiction a reality, you must do one of two things Either (a) you change how everything in reality thinks and moves, or (b) you learn how everything works and what you can and can not do, and learn how those rules can be made to work for you. Choice "b" is what we do with magic. Choice "a" is what fools try to do when they say they want to become cats and fairies and vampires. I do believe that, in an infinite Universe with an infinite number of worlds and an infinite ammount of time any thing is possible. Just not on this world at this time. That being said, 100 years ago it was science fiction to think that we could travel to the moon, or that we could talk to anyone, anywhere in the world instantly. The people who made those things possible learned to understand the laws that are in place, and then learned how to apply them to specific purposes. They didn't set out to change reality. They set out to push reality to its limits.
I do agree that doubts from others and self doubt are a negative force against change. But, you also have to look at whether or not something is possible. Your goal has to be within what we in hypnotherapy call the realm of possibility. If you are trying to do things beyond that, then you are wasting your time. "But," you may say, "people have invented things that were beyond others realm of possibility!" To which I would say "Correct. But those inventions were not beyond the world's realm of possibility, or the Universe's realm of possibility, which we make up only an infinitesimal l part of." So, my advice would be if you want to achieve a goal that everyone else thinks is not achievable, first learn and study everything you can about it. Then, try. And keep trying. And maybe one day, if what you want aligns with the world's realm of possibility, you will achieve it.