Could it be?

Is it so far fetched to believe that your story, that while the idea might have been written about many times before, could be better than and have more depth and parts to it? Is it possible that I might have ideas that no one else has had? Is that selfish of me? Is that ignorant of me? Oh goodness I don't know what to think anymore. If a writer has written a story with a similar idea to one another writer is beginning to write is it pride or selflessness? I just don't know who to believe anymore.