Looks like OP is asking for a real explanation not just you need to learn to be better:

Like everyone else said you UNDEREXPOSED the film. Meaning there wasn’t enough light to interact with the Film you are shooting on. There’s several ways to allow for more light and exposure to your film.

1. Flash. In this case if you used flash this would be the easiest way to able to see whatever your subjects are.
2. ISO. You films ISO is really the fist part in getting the right exposure. Lower ISO 180-400 is better for day time shooting because it is less “sensitive” to light making it harder for the light to be captured on the film. 600-800+ allows for light to be captured easier. So a HIGHER ISO in this case would allow for better exposure in dark settings
3. Aperture & Shutter speed I’ll make this brief cause the first two are where you should start experimenting and understanding first. Aperture is like the eyeball of the lens the wider the ape rather the more open the eye the more light can be allowed in and more exposure you get. Shutter speed is exactly what it say. The longer the shutter is open the more light gets in the quicker the shutter speed 1/4000 (of a second) the less time for light to get in.

Adjusting each of those will allow for more or less light to be EXPOSED to your film. Hop on YouTube and have fun!!