Hopefully making theology simpler to understand! (2 Corinthians 1:12)

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.
Romans 1:16, ESV

Do not be intimidated with sharing the gospel or that you believe.

You should be ready to explain why you believe, but it is okay (as a young Christian, at least) to admit you are not entirely sure of all of the reasons.

Just share how you came to faith.