Weight, tension, pitch

The question is this: Is it possible to confuse pith with vocal weight? I saw a video on YouTube where they say that you can confuse pitch with resonance, but I didn't see that weight can be confused with pitch.

Hypothetically, is it possible to create a feminine voice, but which is built on a higher pitch. Which sounds like it sounds natural. But it will tire quickly, and it will be a heavy weight, the voice will actually be pushed up.

And in that case. How do I know that I really decrease weight, and not just raise Pitch?