I hope that you don't give up looking - because honestly that could discourage others - that are around the same age that you are - and I am to stop.
I believe that when the time is right you will find your birthfamily - I will find my birthfamily and others will find theirs as well.
I am 31 years old and have been searching for my birthfamily for half of my life. Sure some days I feel like giving up and saying, forget this- if they wanted to find me they would, but honestly I don't feel that that is the case.... Most birthparents - Just don't know how to find us... They are usually technically challenged - no offfense- meaning that they don't use computers... you know not everyone knows how - the younger generations - yes they will and do know how to use computers - My birthdaughter- who is only 8 1/2 know how to use it better than I do, this is because most schools nowadays have computers in the classrooms - library, etc. - its a teaching tool to prepare them for the future. My adoptive mother just began using a computer a few years ago - and believe me when I say it was challenge getting her there.
I hope that my birthmother - birthfamily is out there looking for me - I just need to use the tools that were/are available to her, registering with the state you were born with , filing waiver to release information - going and physically retrieving birth certificates and adoption files - anything and everything on papers. Also look in back logs of newspapers - from the date of your 18th birthday - 21st Birthday - 25th Birthdays- these are milestones and compared to the different states and laws - each state has a release date of birth information - when / if it is avavilable. Every state is different - But for those born before 1980 most are paper trails that lead you to your Birth Families.
I wish you luck - me luck and everyone searching luck - one day it will happen - I hope !
Andy