Beowulf is indeed, selfish. I mean he is very good at what he does but he takes too much credit for it. He is everything but modest. He has accomplished many next-to-impossible tasks but he is just too cocky about them for my taste. After Beowulf slays Grendel and his mother Beowulf's soldiers celebrate his as if he is a god. I believe that these acts are what has turned Beowulf so cocky. He has just become so accustomed to being celebrated every time that he accomplishes something, he doesn't even think twice about it anymore.
'I ended his reign, avenged his crimes so completely in the crashing darkness that not even the oldest of his evil kind will ever boast, lying in sin and deceit...' (Lines 2005-2009) Beowulf is very aware of the accomplishments he has made, as is illustrated in the quote above. He does have, in some way, a few bragging rights, but he shouldn't be bragging as much as he is. He needs to learn to be more modest.
