I am not good at phrasing this question, but when I look at my model, I can see through it (a car) and see the texture on the inside of the other side. I rotate around to see if it is actually textured but it seems to only be visible one way, and it is the wrong way. What can I do?
Your normals are flipped. Either re-flip them from the importer / from your 3D modeling application, or write a 2-sided shader (Cull Off)
If that doesn’t make any sense to you, I can detail.
usually when you dublicate a model in edit mode the faces become inverted if you are using blender. When you import them into unity check off calculate normals and tangents under the model settings.