If you’re living vicariously, stop it. Get out and live life for yourself. Vicariously means that you’re experiencing something indirectly, like when your friend's adventure feels like your own.
Vicariously is the adverb form of the word vicarious, which also involves experiencing something through another person. The Latin influence is the word vicarius, which means “substitute.” If you experience something vicariously, in a sense you’re a substitute who’s getting something secondhand.