@Atlanticore709 not only on special occasions
Harry had a lot of reasons to be angry and angsty and even broken. I mean, he was abused all his life. Like he got no breaks. He was locked in a damn cubbord by the dursleys, who told him he was worthless, bothersome, and bad for even existing (and I mean we don't know since when they locked Harry away and used him as their personal houself). When he came to Hogwarts it seemed better but BOOM, Snape hating him for no actual reason (I know he was shitty to every non Slytherin, but Harry Neville and Hermione had it worst) and wouldn't you know it he got from one bs to the next. He had to fight for his life over and over again and what did Dumbledore do? Right, nothing. Harry was nothing but a pawn in Dumbys little plan (and btw. Dumbledore could have prevented almost everything that Harry had to go through).