Mindset

I'm thinking one thing. Were all the people selfish? I consider that I want to anything for everyone who I care. No matter what he/she did hurt me, I was willing to forget all the pain he/she did on me. Moreover, I choose to forgive him/she. I really didn't care about it. However, the people who by my side seems can't have the same mindset to treat me. I'm so disappointed about it. Could it be said that forgive a people who you care is difficult?