Does being adopted make you feel like an outsider?

I was adopted when I was young and I never really felt I truely belonged. Elementary school was bad, didnt have any friends hardly. High school was even worse, deep down inside I felt I never would belong. Even my adoptive parents ignored me when it came to problems like this. Even now I still feel I dont belong with them, even though part of me still wants to be in communication with them. Is adoption really a good thing or a bad thing. I kept telling myself it was bad, maybe I was adopted out of pity not love. That could explain their lack in caring for me. Anyways I need your advice, does my adoption make me feel like an outsider?