@Crowxe, I think you are still holding on, whether consciously or subconsciously, to a notion of some absolute universal "rest" frame relative to which everything has an actual speed (in an absolute sense), and probably trying to figure out ways you can detect or measure this speed, like what's the actual speed of the Earth through space.
Many physicists over many centuries have wondered and tried the same and, at least for mechanics, they have realized since Galileo that there was no such thing, or at least mechanics didn't offer any means for detecting such absolute speed or rest. The laws of mechanics obeyed the Principle of Relativity, they were the same in every inertial reference frame.
But there was one thing that wasn't covered by Galilean relativity and which could potentialy be used to measure this absolute speed, light (electromagnetism), thought to be carried by a medium (luminiferous aether) which determined its speed. Many experiments were performed, first to mesure the speed of light with ever increasing accuracy and then to try to measure the speed of the Earth through this hypothetical aether by detecting variations in the speed of light measured at different times of the day or year and in different directions as the Earth rotated on its axis and orbited the Sun. But the speed of light always turned out to be the same no matter what, all attempts to detect or measure speed relative to the aether were unsuccessful.
Einstein realized that the Principle of Relativity must also apply to the laws of electromagnetism extending the PR to say that all laws of physics are the same in every inertial frame, which also implied that the speed of light must be the same in every inertial frame (the two postulates of Special Relativity). Basically what this means is that if you are in a closed box floating somewhere in empty space (and you cannot see outside to notice stars changing position) there is no experiment whatsoever that you could perform inside the box to determine its absolute speed, so the notion simply doesn't apply. And even if you do look outside and see the stars moving that doesn't mean that the box is moving, or that the stars are moving (in any absolute sense), it just means that they are moving relative to each other. It makes no sense to ask "but which one is really moving?". The answer would be "from who's perspective?". From a star's perspective the box is moving, from the box's perspective the star is moving, from some other perspective both the star and the box are moving, and all those perspectives are equally valid.
As a first step towards understanding relativity you must give up any notion of absolute rest or motion, speed is purely relative, anything can be considered moving or at rest simply by changing one's point of view or perspective.
Regarding the speed of light being constant, you must differentiate between two notions: speed and velocity. Velocity is a vector, it has a direction. Speed represents the magnitude of the velocity vector, and is just a value (has no direction). Speed is the one that's constant and cannot be changed, the velocity is observer dependent. The direction of the same pulse of light can be different for different observers, no physical aiming of the source in different directions is necessary for this.