the first one is a sub vent against a person who has tried to emotionally attack him. he let them in and is kicking himself for it. now all he wishes is that the part of himself which trusted this person would just die. equally this type of dream can come just before real world flue's but the school theme indicates it's a social thing turned inwardly.
the childhood dream is typical of a boy realising his place in a much larger world. and at that age it's not surprising.