Hello there, well that answers a lot of things.
There is a show in the UK called Long Lost Families and many on it have expressed the same longings you have.
Since you are adopted, I am guessing your parents are not forthcoming with any information?( you would have to reassure them of why you want to find things out), the only thing I can suggest is maybe searching births/adoptions where you were born.
Starting with your birth certificate.
In my former post I said to only talk to a Christian, but if it is a case of searching for adoption information this would not be necessary and quite often you may feel more comfortable discussing this with someone you don't know.
If you do some research on line you will probably find some information as to how to go about it.
Perhaps you don't want to do this as there can be many outcomes in this sort of situation, some good, some bad.
In any case you must come to the position that you can fully accept that your loving Heavenly Father and His children are all your true family and heaven your true home.
God bless you and praying for you.