It seems like that's a big question for a lot of people. I often get trapped by another version: "What will people think?" But that concern has a name in the Bible. It's called the fear of man. And "the fear of man bringeth a snare" (Proverbs 29:25). If I'm focused on how people think of me, how well I fit into my culture, and whether those people will still be my friends, where is ther room in my mind for thoughts of God?
That verse in Proverbs ends like this: "Whoso putteth his trust in the LORD shall be safe."
"If God be for us, who can be against us?" (Romans 8:31).
Instead of "Is that cultural?" and "What will people think?" let's ask "Is that biblical?" and "Would my Savior like that?"