I’m trying to drill holes for 3/16 screws in the walls of my room, but the drill is unable to penetrate through some parts of the wall. At first I thought I hit a nail, so I tried making another hole and got the same result, and repeat. I know it isn’t mechanical failure because I successfully went through one point in the wall. See the picture before for the one successful attempt at drilling a hole and two unsuccessful ones
Fwiw I’m drilling about one foot from the ceiling. I’ve tried this at multiple points in my room, and the drill still won’t go through. What could be behind the paint and plaster?
Edit: these are the drill bits I’m using: https://www.target.com/p/blue-ridge-tools-8pc-hex-shank-drill-bit-set/-/A-78262232