Dear Amy,
In non-work environments, we should never be ashamed to talk about the Lord and His Gospel. When Jesus commissioned the Apostle's, by extension, he was also commissioning all baptized Christians to preach His Name to the world and to others who don't know him.
This is what the very first Christians did!
When we are at work, we are being paid to work, not preach the Gospel. Our prayer and evangelization is reflected in the quality of our work and as an expression attributed (by some) to St. Francis reminds us:
Preach the Gospel to the world, and when necessary use words.
Whether it is a sin to be afraid, ashamed, or embarrassed to talk about the Lord and His Gospel depends on the person or people you are talking with and the situation or environment. Most of the time, it is not a sin but you should still bring this issue up in Confession so you can receive the extra graces and counsel to give you the courage to talk about the Lord to friends and family when it is appropriate.
The very first Christians died for the faith rather that hesitate in preaching about the Lord.
Talk to your Confessor and go with his advice.
I hope this helps,
Mike
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