Although a person can theoretically be a Christian and not be involved in a church, involvement with other Christians is a super important way to help us learn how to live for God (as we study the Bible together) and to encourage each other in living for Him.
By being involved in youth ministry, you have opportunities to build friendships with Christian peers and to study how the truth of the Bible relates to the things going on in your life. And it gives you opportunities to learn from, be encouraged by, and develop meaningful relationships with adults who volunteer in this ministry. I am a big proponent of this. AND I am also a major encourager of teens being involved in the broader life of the church and I’m very happy that our church has teens involved together in many of the things we do as a church!
Being involved in the worship and activities of the church as a whole allows you opportunities to see many positive Christian role models, develop meaningful relationships with people in the broader congregation, have experience with worshipping and learning together from Scripture as a congregation, and have meaningful involvement as you serve in various ways.
I think it is great for Christian teens to be able to contribute in meaningful ways to others within the broader church by encouraging others, being a good example - to both younger and older people - and by helping serve.
I encourage you to make it a priority to participate in church worship services, ideally together with your whole family. Perhaps you could volunteer to serve regularly with church ministry, like by ushering, children's ministry, or another way. You can join in with all-church events, such as Thanksgiving Eve and Christmas Eve services, and participate with church work days. If your parents sign up to make a meal for someone in the church, perhaps you can help. (If your family as a whole attends another Bible believing church, then apply what I am saying by being plugged in there.)
And, I encourage you to pray for, look for, and find one or more Christian adults to be role models/mentors//disciplers in your life. Your parents are hopefully taking an important - if not the most important role - of helping disciple you for Christ. But it can be a very helpful thing to also have other Christian adults involved, who you can look up to and/or who can encourage and pray for you!
Maybe there is an older Christian adult in the church that has a similar interest that they can share with you. Maybe you can do a specific Bible study. Maybe you can get paired up with an adult in the church who is doing a ministry that would be a great fit for you. Perhaps you can ask one or more adults to pray for you.
If you would like to do this, but need help thinking of someone to connect with, you can talk to your small group leader. And, whether you ask your small group leader or not, more importantly be sure to get input - or at least an okay - from your parents about adults you might be interested in doing something with. At the very least, that is important for safety! And, they may have some great ideas as well!
Pray to ask for God’s help to be connected in the life of the broader church and for godly adults to be involved in your life. And, if you are a Christian, pray about and seek ways to contribute to others - younger and older - as well!