Here's why:
* Subject Pronouns: "I" is a subject pronoun, used when the pronoun is performing the action of the verb.
* Object Pronouns: "Me" is an object pronoun, used when the pronoun is receiving the action of the verb.
For example:
* Subject: I called you. (I am performing the action of calling)
* Object: You called me. (Me is receiving the action of calling)