How do you know if you are born again?

This question resonates with me because for many years I struggled because I was ignorant of the devices of the devil. The devil constantly makes us second guess our status as Christians. The episodes has scriptures that re-affirms our position as God's children- Assurance of Salvation. 

Roman 10:9, John 14:20, Colossians 2: 13-14, 1 John 1: 13

If you will, please share, how, when or where you got saved to encourage me and other listeners.