Jesus Christ knew all about the human tendency to feel inadequate. That is why He assured His followers they would receive a Helper - the Holy Spirit - who would come to abide in them forever.
1 John 3:16 defines love based on what Jesus did for you and I on the cross, "This is how we know what love is: Jesus Christ laid down his life for us." To what extent will you love someone?
"To avoid satan's deceit, study God's word carefully and regularly. When you know what God says, you will not fall for satan's lies."
-Life Application Study Bible (NIV)
Some of the same people claiming to believe in Jesus at this time would later yell "Crucify him!" It's easy to believe when it is exciting and everyone else believes the same way. But keep your faith firm even when it isn't popular to follow Christ.
Success must never be measured by popularity, fame, or fortune, for these are temporal measures. . . God measures our success with the yardsticks of obedience, faithfulness, and righteousness. If you are faithfully doing the work God gives you, you are successful in His eyes.