Dreaming that you are extremely tall symbolizes desire for freedom. You could have escaped or have come out of a tough situation or a difficult relationship.
Dream dictionary: Extremely tall dream meanings
…(Height | Size) To see oneself taller than usual in a dream means increase in knowledge and wealth. If a man of authority sees that, it means expansion of his power. If he is a merchant, it means business prosperity. If one sees himself extremely tall and beyond the tallest human being in a dream, it means the nearing of his death, or it could mean his downfall. It is ominous for a tall person to see himself short in a dream, for it also denotes falling in rank, losing respect, or nearing one’s death. Even seeing oneself shorter in a dream means death. If one sees his figure taller in a dream, it means that his authority will expand and he will win victory over his enemies. Tallness of one’s figure in a dream also denotes longevity. If a short person sees himself tall in a dream, it…