自懂事以来
zì​dǒng​shì​yǐ​lái

for as long as one can remember

  1. 自 zì preposition
    from
    from; since; used in formal or written contexts to indicate a starting point in time or space
  2. 懂事 dǒng​shì
    sensible
    to be sensible; to understand things; to be aware of what is going on in the world, especially of a child who is thoughtful or intelligent
  3. 以来 以來 yǐ​lái preposition
    since
    since a specific time in the past until now; in the past period of time