Sharing my faith

I guess I have a difficult time sharing my faith. Quite a few times lately I’ve had an opportunity to talk more about my faith, but I clamed up when given the chance. I don’t know why that is. In high school I was the typical “I’m right and you’re all going to you-know-where” type. I must have mellowed out in college and in the workforce subsequentially.
Is it that difficult? I tell my kids in my class all the time to invite their friends to church, yet I’m not doing it myself. Ugh. It is so difficult. I don’t want to be put in an alkward position of trying to explain my religion to people. Yet I don’t want to be made feel ultimately guilty on judgement day when someone starts singing “You Never Mentioned Him to Me.”
For me it is so much easier to talk to kids about Christ than my peers. Kids have a tendency to listen and to be less jaded than the older society. Many adults have had their fair share of organized religion and came away (unfortunately) with negative feelings about the whole thing. I hate that. I wish things could be better. I wish whatever turned them off of religion never happened.