Trying to find my birth father

I am now 25 yrs old and the man I have known all my life as my father has died. I was told at the age of 9 that I was adopted by my aunt and uncle. I thought they were just my parents. I met my biological mom when I was 12, I still talk to her. I have asked her and my mom and my sisters and brother, who is my biological father? Noone knows. They know who my sisters father is, and who my brother's father is. But when it comes to mine....noone says anything. I don't look like my biological mom or even like any of my siblings. I was born in lakewood,nj and I have a last name you don't normaly hear. My biological mother never married and I have her last name. I was hopeing that by dna testing, maybe lakewood courts or even just NJ courts would have a match for me. But I don't know if such a thing is possible. I am a mother of a 2 yr old who doesn't know his pop pop is gone. I just want to find my dad and meet him, or maybe not meet him. idk at this point.