Is time travel possible and if so did some people already do it?

Depends on where you're going, it's theoretically and scientifically possible to travel to the future because it's going to happen, but much more complicated and nearly impossible to travel to the past, because it already, well, happened. But time travel is nearly impossible in any frame with today's technology, and from a scientific standpoint, may never EVER happen because of the immense power and technology that may be needed for it. So short answer, scientifically possible? In a way? Yes. Has anyone done it yet? Will anyone ever do it? Most likely, no. Sorry if that makes you sad haha, we are creatures trapped in present time, and here we stay. Maybe for good reason too. But research and explore yourself, you never know, but if you ask me, we should stay here, we shouldn't mess anything else up as a species if you ask me. Food for thought.
Hope this helps :)