The Lord tells us in His word that we should not be ashamed of Him or of His words.  The apostle Paul teaches us the right attitude with his declaration in the book of Romans:

For I am not ashamed of the gospel, for it is the power of God for salvation to everyone who believes, to the Jew first and also to the Greek.  (Ro 1:16)

For whoever is ashamed of me and of my words in this adulterous and sinful generation, of him will the Son of Man also be ashamed when he comes in the glory of his Father with the holy angels.  (Mk 8:38)

For whoever is ashamed of me and of my words, of him will the Son of Man be ashamed when he comes in his glory and the glory of the Father and of the holy angels.  (Lk 9:26)

We should never feel embarrassed or uncomfortable that we are Christians.  Additionally, we should never be ashamed to share testimonies of our answered prayers, or of our salvation experience and the blessings of God. 

For the Scripture says, “Everyone who believes in him will not be put to shame.”  (Rom 10:11 ESV)

The gospel of Jesus Christ is truly the POWER OF GOD to everyone who believes.  Let us rejoice in this truth and praise the name of the Lord!