I don't think anyone can really advise you on what to do, not knowing the people involved, but I would definitely tell you to be prepared for rejection or disappointment if you do decide to contact your birth family members.
I tracked down my birth mother when I was 21, and we rarely talk. When we do, it's pretty awkward and not at all fulfilling. I also know some adoptive/birth people that have reunited, and even when it's good, it's still a lot of hard work to build something that resembles a relationship. I don't know a single person who has said meeting solved any problems or was in any way an easy step to take.
My heart is with you, whatever you decided. I do know how hard this decision is to make, and the consequences are never what was expected.