The short form of a noun clause(that+ normal sentence..)

Hello friends.

To say "It is making me sad that my computer is used by someone else.",

Which one of them should I say?

"My computer used by someone else is making me sad." ( I think it is not true, it seems like my computer is making me sad.)

or

"My computer's getting used by someone else is making me sad."( It should be correct because we can normally say my+verb+ing, your+verb+ing..)

Thank you.