If the Universe is infinite, doest it means every kind of possible living creatures are existing right now?

Though the void that is space could be infinite, the matter and celestial objects within it are finite.

There is a well know argument that suggests that if the universe had infinite matter occupying space then every line of sight would land upon some distant star or galaxy and the entire sky would be as bright as the sun all day and night. Because it is not, we can deduce that there is some finite limit to the celestial population of the universe.

A simple counter-argument is that the light from infinite stars are still in transit... however, if this were true, then the skies should gradually get brighter and brighter with new stars continuously appearing in the sky. Which it is not.

Additionally we have resolved that the universe beyond the dense clumping of galactic matter is transparent, and not obscuring an infinite field of galaxies beyond our ability to see them.

Ok... so with all that said, there are still astronomically enormous amounts of galaxies, stars, and planets that can meet the same or even more ideal conditions necessary for life and the ability to produce human-like civilizations. It's all a matter of probability. It's an interesting prospect; wondering if "human" is some sort of inevitable default for life to evolve to, or if alien civilizations will be entirely exotic from one potential planet to the next.

Not all infinities are equal. There are countable infinities like the set of counting numbers, and uncountable infinities like the set of real numbers. If the cardinality of allowable creatures is less than the the cardinality of available environments, then yes; all of the allowable creatures must exist somewhere in the infinite universe. I am not a mathematician, so I can't say which set has the greater cardinality.

By the way, I believe the universe is infinite in time, distance and scale. I also believe in googolplexes of tangent universes branching off every second.

Yes. Furthermore, our little part of the Universe, the part inside our event horizon 13.7 billion lightyears in radius, is finite: it's a finite volume, with a finite number of quantum particle states.

That implies there are an infinite number of copies, some with a "you" that is exactly the same, and some with all possible variations. Everything that could happen to you will happen in an infinite number of them.

It makes sense but for this they use the Parallel Universe theory. It states that there is an infinite number of parallel universe with every single possible situation that would've happened in the pass, or that could happen in the future.

Yes. If the universe were infinite then the answer is yes. There would also be an infinite number of Earth's with identical copies of you and I.

However, the universe is not infinite.

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Possibly, but not of necessity. As an example, there's Zeno's paradox of Achilles and the Tortoise. It seemed a paradox until Gregory, ca. 1670, elucidated the concept of converging series. The universe is unlikely to be quite so simple as that, but the concept likely applies to some degree, and there are obviously some limits to what can exist, even if we don't know what all the boundaries of possibility might be.

Statistically speaking, in an infinite universe every possible situation should exist, BUT our universe may not be infinite and statistics are not always correct.

That's party true,...if the universe was infinite..i doubt that every possible creature has existed on it...they all could one day..but i dont think at this current moment..no.

The universe is not a finite size, it is just so incredibly large that we simply cannot process its size so our brains just associate it with being of infinite size. However, the possibility of having a diverse amount of living organisms throughout the universe is very real.

The universe is not "infinite" in the sense of encompassing all possibilities.