Was Jesus God because people addressed him as "my lord." Not according to the Bible. In the Bible we find that this was a common practice with many others besides Jesus. For example:

Prophet Abraham:

"Therefore Sarah laughed within herself, saying, After I am waxed old shall I have pleasure, my lord (Abraham) being old also?"

Genesis 18:12
 

Esau:

"And he commanded them, saying, Thus shall ye speak unto my lord Esau; Thy servant Jacob saith thus, I have sojourned with Laban, and stayed there until now:"

Genesis 32:4
 

Joseph:

"And we said unto my lord, We have a father, an old man, and a child of his old age, a little one; and his brother is dead, and he alone is left of his mother, and his father loveth him."

Genesis 44:20
 

David:

"And fell at his feet, and said, Upon me, my lord, [upon] me [let this] iniquity [be]: and let thine handmaid, I pray thee, speak in thine audience, and hear the words of thine handmaid."

1 Samuel 25:24

...etc.