About the sun question.

Dear everybody,

I have a quesstion about the sun.

We know the sun every day burning, so its diameter is contracting for 7-8km
every year. Now, the sun diameter is about 1,392,000km. Then, before
1,000,000 year ago, it may be a big sun. Its diameter is possible have
8,392,000km.

If that is true than must be no living being on the earth.