Trying to Understand Relativity

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I have always been fascinated with the Universe, but had a difficult time to understand the concepts behind it. I do not come from a science background, and it makes life a bit more difficult. However I recently got into trying to understand how everything works. So here is the first of it all-Relativity, as put forward by Albert Einstein. So what is the Universe? Well, everything around us is the Universe, but what's visible to us is like a negligible portion of the universe. The vastness of it cannot simply be explained or even measured. So we'll just leave it at being 'big'. So what is Relativity? It is the idea that speed of an object can be perceived differently by two people depending on where they are. Or at least this is how I understood it. Let me explain. If you are travelling inside a car (travelling at 50 mph), the speed of you body is 50 mph too. But do you feel your body moving? No. It stays still inside the car. So to you, the speed of your body is 0 mph. But to a bystander in the sidewalk, your body is moving at the same speed as your car. That's how two people can perceive speed differently. The idea is that speed is relative to the objects around you.