True Friends?

So here is a question that I pose to you. Do true friends really exist or are people too selfish by human nature? It's said that finding a true friend is like finding a gem in the mist of a pile of rocks. Is this saying that finding a true friend is rare or too rare to exist? I believe that it is the latter. I believe that people are too selfish to truly care about another (This of course excludes family and significant others). They are only concerned about what benefits them in that moment. Meaning which person can they use the most. True friends are ALWAYS there for each other through hard times and all and even when being their friend may be hard and not beneficial to you. True friends don't pass judgment and except you for who you are and they definitely don't speak hurtful words that aren't justified! Is it too much to expect from a person a true friendship and a selfless relationship? I'd hope to think that I can do this and I know that I can be selfish at times but I really do try all I ask is the same.