Because he had heartbreak and a sad life. He also hated Harry Potter.
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Wizards' Patronuses can sometimes change shape. Severus Snape loved Lily (Evans) Potter and so his patronus changed shape to the same one as Lily, a doe. It is very likely that Snape's patronus didn't actually change shape and was always a doe since he had loved Lily all his life.
Harry learned a few things, but the most important was that Harry would have to die in order to destroy Voldemort. He also learned that Snape has always loved his mother, and that he has been working as a double agent for seventeen years.
Snape's patronas takes after Lily Potter's because Snape was in love with her.
the " snape, snape, severus snape, DUMBLEDORE!!" song is a youtube video. to see it type in, Potter Puppet Pals and The Mysterious Ticking Noise. there are also many more PPP (Potter Puppet Pals) videos but i cant name them all. :( sorry
Harry Potter reminds Snape of Harry's father, with whom Snape had some trouble as a student.