One of the best way to live a Godly youthful life is Keep studying your faith. Continue to study and learn about your faith as you get older. Know that even adults still work on the tough questions.
Come to youth group with a heart that wants to learn. People will notice a change in your group. Start answering questions and step out of your comfort zone. Once you step out of your comfort zone, others will start to step out of theirs. [5]
Spouting verse is all well and good, but understanding the deeper meaning behind it all, how it fits into the entire narrative of the Bible, is more important. You can say "God so loved the world that He sent His only begotten Son..." (John 3:16), but until you can show that same love to others, it's difficult for others to see the positive change caused by your faith.