Well, (and this is just my personal opinion) I think a person has to wait until someone inquires about the faith. I myself, don’t appreciate it when people accost me with their religious viewpoints like they assume I’m not a Christian.
Sometimes it is in ordinary conversation. I make it a practice to say “God bless you” to all salespeople and others who show me a kindness, like giving their seat on the bus, or letting me go ahead in the line at the grocer. Small things like that. Sometimes someone will say "Oh, are you a Christian? and then I say yes, I’m Catholic. They invariably proceed to ask questions, and THERE is my opportunity to either 1) Share faith experiences, 2) re-Catechize fallen away Catholics, or 3) correct misconceptions about the faith.
I generally wait for an opening. I don’t approach strangers. I also teach the faith in a parish, so I have plenty of opportunities what with non-Catholic parents, visitors, and the people I regularly are responsible for.
You might want to volunteer at the parish Sunday school program. It’s a good place to test your skills, and the children are lovely. You’d be amazed at how much your can learn from children as to TRUST in the Lord. They get it. Sometimes we adults make it too complicated.
When you say you are ALONE…how do you mean that?