Problems with texture painting

hi i am pretty new to blender, and follow along the video tutorilas of “Blender Guru”

i am stucked a the texture paint part, where he paints on the flat texture image (left side) and the complete donut on the right side is painted, i followed his steps, but what happens to be is, that it paints every face on the donut (which are a lot) if i try to paint on the object itself, blender crashes.

can anyone help me?