What can you do when you know your parents are not your real parents

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A girl wants to know me at first so i met her than we became friends but oneday she took me to her home and her aunt just old me her parents are my real parents. I shocked and tears came out, my parents are really nice and good to me all these 20 years, how can i accept this suddenly? At first i just forgave my real parents because they said they were so poor and i was a girl instead of a boy so they gave me to other, but now i am really not sure if i want accept them, all this time cause a great sadness to my family and i just stopped the realtionship two weeks ago with my real parents even my sister. I think my real parents now have son and daughter why they want me back and all these times they just use me to help them to be with them , i didn't find anything that can prove i want be with them so i stopped seeing them and i want be end but my real mom just so sad and send me email moan about my parents are selfish an i am selfish. i am angry ,i think they are selfish and it's them who gave me away after i was born