I suggest that you download Amidst v4.6, run it, select a VANILLA profile for the PCMC version you prefer,
and start hitting Ctrl-R. (the link is in my signature)
That will cause Amidst to display the biome maps of random seeds.
Ctrl-H in Amidst gives you the seed input dialog.
Amidst 4.6 works with MC Java releases 1.0 up to and including 1.16.4.
Hint: Place Amidst in it's own folder and create an empty file in that folder named "history.txt".
When Amidst starts up it will detect that file and from then on will log of every seed that it displays to the end of that file.
That way, if you hit Ctrl-R too quickly you can find out what the seed was of the previous map and redisplay it.
I use Notepad++ as my default text editor as it will update itself if Amidst adds a line to history.txt while it is open in a Notepad++ tab.
In your case you can turn off all layers except the spawn location so that you don't see structures.
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There are no dangerous weapons. There are only dangerous people. R.A. Heinlein
If you aren't part of the solution, then you obviously weren't properly dissolved.