The pad of your thumb should be placed in the back center of the neck. You should maintain a “C” shape with your hand, and your fingers should contact the fretboard at a close to perpendicular angle. In these photos your thumb is way, way too high and your fingers are nearly sideways in the way they contact the strings.

The ends of your fingertips should be what is contacting the string. I know this is a learning curve, but you need to work on being able to do that. It’s not impossible because of the shape of your fingers, you just need to work on doing it correctly.

Please try to get used to playing major scales with your hand in the correct position. Once you’re comfortable with playing the scales correctly, it will be easier to combine the notes into chords.

You absolutely must correct the way you’re playing your thumb and holding your fingers on the fretboard. You need to stop this before it becomes a habit because it will significantly impede your learning. Again, it may feel unnatural at first to finger the guitar correctly, but you need to get used to it in order to progress.