Separate cursor for bind value assignment, is this normal

I am trying to generate some load by executing many OLTP-like inserts insert into mytab values( :b1); ( purpose of using :b1 is to not flush shared pool)

SQL> select sql_id , sql_fulltext from v$sql where rownum <30;

SQL_ID       |SQL_FULLTEXT


-------------|--------------------------------------------------------------------------------


6hrwjapxkw001|BEGIN :b1:=1974764; END;
8gnkm19fh0004|BEGIN :b1:=1964843; END;
88dnrt2984007|BEGIN :b1:=1980965; END;
1qqk2h4u2000a|BEGIN :b1:=1966014; END;
b1qvjscn4h00c|BEGIN :b1:=1956268; END;
7pxamcspqn00c|BEGIN :b1:=1992032; END;
9nqpjvwaa800h|BEGIN :b1:=1961924; END;
7vdnnakbdh00j|BEGIN :b1:=1969642; END;

But i am getting 1000s of cursors like above and it is thrashing the shared pool.
Is it a expected behavior, never seen like this earlier. SQL> select count(9) from v$sql where sql_text like 'BEGIN :b1%';

  COUNT(9)