Hello, i'm new and i have a few questions about my Canon 700D (non t5i rebel)

Ok first off i made sure to set my iso at the lowest it could go with out being underexposed.
Then i set my aperture to the widest it could go.
Then i set my shutter to the correct speed for my fps settings (1080p 24p)

After all that i set my color profile to user def 1 and edit to be the flattest possible
Now i press record and it seems my video is just crazy bad even with lots of light in the room. What do i do? Where id i go wrong? I used a tripod before and it still looked grainy and bad.

any tips to improve? btw im using kit lens