"I" and "me" are examples of words that you might easily consider to be the same, simply because they are most times used when talking about one's self, or when describing things that pattern to one's self. However, the major difference between the two words lies in how both are used when forming sentences.
While a lot of people might not find it hard to figure out that both words are pronouns; however, many may not know that "I" is a subject pronoun, while "Me" is an object pronoun. "I' is used mostly to replace the subject of a sentence. On the other hand, "me" is used to replace the object of a sentence.
At times, deciding where to put each word can be a problem. However, all you need to do is to determine the subject and object of the sentence. For example, the lion is moving very close to me. Here the lion is the subject, and "me" is representing the object pronoun. So, it will be very wrong to say: the lion is moving very close to "I".