Gravity in relation to particle physics

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Alright, full disclosure here, I have a high school education, and that's it. Nothing higher, and I have no interest in getting a higher education.

Now, I have had these thoughts and questions bouncing around in my had for weeks, and I really need to get them out. So here we go.

Why is gravity considered to be (at least that is how I was taught) an extension of particle physics, one of the four fundamental forces? As far as I know gravity is the curvature of space-time and how matter interacts with it. So matter, especially dense matter, causes the curvature of space-time, and other matter within that curve is attracted to the centre or source of the curve. Which goes into the second question.

Why is time considered separate from space when both are the same thing, just one is defined as movement in a direction that we cannot directly perceive, and only experience? Its still space, we still exist within it and it is no different than us moving through "regular space", Its just one happens to be voluntary and one seemingly isnt. So why is it still taught to be that? Im not so stupid to think that this is some kind of groundbreaking discovery or some shit, just really confused as to why I was taught something that seems to be blatantly untrue and has been known to be untrue for a very long time, but me thinking about it has me running in circles in my own head. Im probably just nuts, but I would genuinely like an answer.