The search that goes on for all involved in an adoption can take years and be very frustrating, but I do believe that if it is really important to you than don't give up on it all together. If you are feeling too frustrated put it aside or on hold for awhile. The thing with this searching business is after you have exhausted one avenue there is always another and then another. I have just joined the board and haven't read many of the boards but noticed no one mentioned the Search Angels - these are volunteers who help people who are searching and asking the questions like I see on this board.
Now I realize some people search all their lives and never find, but if you just give up you will always be wondering what if you had kept looking and what if you did find and because you gave up you missed your chance. Also, if you wait until later in life, you risk the possibility of birth relatives passing before you get a chance to know them. Believe me I know how hard this is and how hard it is to also commit to the search process. From my own experience if you are able to find, whatever information you get (even if it is rejection, rejection usually also comes with information) and that information whatever it is will give you some freedom in that knowledge and most likely help seal any holes you might have with you identity. (I am not saying you have any, just that most adoptees do and even knowing medical information helps you better understand your identity).
I gave up on my search in my 20's and I really thought I was done with it. But then slowly it crept around in the back of my mind - because I think the truth of it is, that we (adoptee's and birth mothers and maybe birth fathers and siblings who are aware) can never stop asking those questions - I wonder what they are doing, I wonder who they are, are they ok, are they happy, are they alive, what do they look like? I wonder this and that and so on. And what happens when we don't know the answers is that we can't help but make up our own answers in order to keep ourselves sane - sometimes we fantasize great things and other times we go down a dark path - but the problem is we don't really know and none of our guesses are the truth anyway.
Another thing I learned about my giving up on my search in my 20's was that while I did try initially and I hit a brick wall (I felt like people had the names of my birth mom and wouldn't give it to me), I still had a lot of fears (very severe) about what I would find, but in my 20's I wasn't aware of any fear issues as I was a tough one on the exterior and not in touch with myself at all. Being rejected was lower on my list of fears and in a way I used giving up as an excuse not to face my fears (I am not saying you are doing this) but I did - I just didn't know it then, but I know it now.
Over the years, I started to say - someday I will try again and then it seemed that this adoption thing, combined with a bad childhood and a failed adoption, along with a bunch of other things made me have a sit-down with myself one day. Actually I was driving home from work (a 60 mile trip from H E double L) and I told myself that I needed to quit saying maybe someday I will try to search again - I needed to decide once and for all if I was going to do it or not, I had built a good life for myself, I had my prolems but I needed to decide and stop trying to decide over and over. By now I knew what my fears were and they were quite fierce. I finsished my long drive home from work and still had not made up my mind. I parked my truck at the end of my driveway on the side of the road (the house is some 400 feet from the road) and I told myself I wasn't going to the house until I decided once and for all - it was time - it was a life changing decision. I think I sat there for at least a half hour. I finally reasoned that there was freedom and knowledge and that I was going to blindly walk into my fears and face them and committed to myself to make it my Project Priroity (I believe this is a Dr. Phil term) and give it my all. I drove down the driveway, took care of my dogs and changed my clothes and I called an Adoption Search Agent that I had saved an email from that I got years before from entering search info on some web site and called her that evening and made the commitment to work with her and start my serious search there. I have not regretted one moment of it. I was in therapy before I made the decision and while I searched and while I reunioned and still now as I reunion with my father's side of the famliy (I have a total of 13 half-siblings and a living birth-mom who loves me!)
I would go so far to say that even if I didn't find yet and I was still looking,I would recommend to all that if there is any possibility of finding at all - then there is hope and that the finding makes if worthwhile. You need to accept it will take time, may be frustrating and you need to prepare yourself, understand your fears, prepare for rejections and accept that it might take a long time. Use the Internet as a guide, there are a gazillion resources out there. There are also professionals who can help which of course mean $$$ - but if you really want it, then save up the $$$.
I am so hoping to be on the Dr. Phil Show to tell my story - I want to offer hope to everyone who is still searching and get the word out that it is possible (obviously not in all cases) but that I think any possibility of finding makes any amount of searching worthwhile.