Keep in mind that Focal Length will change how fish eye distorted or straight-lined your scene looks; it's an artistic tool that distorts or flattens. This example shows how different mm lenses can shape a subject:
Also, your scene is full 3D, including the text. You could push the text away from the camera in Z-space or move the camera. OR you could scale the text size smaller.
You can also view "Scene Properties" tab to see and change the units of measure in your scene that the grid corresponds to. This will aid you in making objects at a particular scale if you desire. Some rules of thumb I try to follow: if it has to be a realistic render, then I try to match real-world measurements as close as I can. If it's abstract like text and motion graphics, then I have some wiggle room, but don't go too big or too small and don't go too far from the center of the scene because it just gets difficult to manage. I think larger objects may affect renders because of light photon density... but that's unverified on my end.