['I am so annoyed with my brother...ugh sometimes I wish I was an only child.', 'I would think that being an only child would be somewhat boring and lonely.   HOw bad can it be with your brother?', "He borrowed my lucky pencil when he knew I had an important test today. And he knows I can't function without my lucky pencil during a test! :("]
That's not cool!  I hope you did well in spite of not having your lucky pencil.  Siblings can be quite pesky at times!
I am so annoyed by my brother, He borrowed my lucky pencil when he knew I had an important test today