How to preserve mixed case in Data Dictionary

Hi,
I am very new to Oracle, please excuse in advance for silly questions.
Using Oracle 9i R2, SQL Developer 1.51.5440.
I don't know if it's Oracle DB or The SQL Developer tool, but the names of the object I create are all transformed in uppercase. Table name, column names, procedure names all are displayed in uppercase. And yet I make sure when I created them to use carefully mixed case to improve readability. Example: ProductID, MyTable, etc.
I've gone over the options of SQL Developer, but I didn't see any option to turn off the automatic uppercase. Some objects still remains in mixed case, for example the content of a procedure still looks like when I typed it.
Is there a way to get the object names to be displayed exactly as I created them?
Thanks in advance.

Ok, now I see, make senses that everybody keeps using uppercase. I have tried this:
CREATE TABLE "MyTable" ("Col1" number not null, "Col2" varchar2(20) not null)
And indeed, even SELECT * FROM MyTable would not work, I have to reference the table by SELECT * FROM "MyTable"
FYI, in SQL Server, object names are case-insensitive. The name saved in the data dictionary is exactly how you type them. In the queries, constraints, indexes, etc., you can reference to the object name by any case. I find this way more convenient.
One more question, in the current schema I am working on, where all object names are uppercase. How come I can still make a query with any case?
For example if I type in SQL Developer: SELECT ProdUCTID, PrOduCTNaMe FROM T_proDuCT ;
The query executes OK although I'd expect Oracle would complain about table not found. So are the following rules correct?
1. If the object name was saved with double quote, Oracle will preserve the case and the object should always be referenced WITH double quote and the exact case.
2. If the object name was save without double quote, Oracle will uppercase the name and the object can be reference by any case.

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