I mean, like how can it exist?

Ain't it a man-made concept of measurement to measure stuff like change or transitions of the universe?

If time does exist, why does it go faster/slower in other parts of the universe than here on earth?

Too deep for my brain. I'm a Rihanna stan, I can barely grasp simple addition and subtraction.

What?

It doesn't "exist," it's a artificial concept to help us understand and organize life and the universe.

Just like numbers.

The only existence is the present.

The concept of time is a relative (depending on the objects or viewer's perspective of it) one, therefor, time doesn't actually speed up or slow down anywhere or anytime.

It's relative to our biological clock which can be slowed down or sped up by various states of consciousness

Time in the human sense is not real. It's just how humans measure things. Time on Earth is different than the concept of time in Jupiter. Even the years we count is not really correct because we use the Christian method (the years since the death of Christ), while other groups use theirs.

Time is a measure. In reality, it is (or seems to be) infinite.

Time is just the calculation of the revolution of the sun

What kind of self drag?