Unless the Lord builds the house, they labor in vain who build it. Psalm 127:1
If God instructs us to preach the Gospel to someone, He promised that the Holy Spirit would give us the words to say. Are these teens asking questions and do they have a hunger to know Jesus Christ? If not, it's pointless to try to save them in your own strength.
Sharing the love and grace of Jesus Christ should not be such a heavy burden, Sister Hailee. It should overflow from you in joy and in the power of the Holy Spirit. Remember how when Jesus walked this earth, He didn't hunt and chase people down. The sick and the lost came running and looking for Jesus! And those who turned away, Jesus didn't try to stop them. He let them walk away.
If you have a burden for these teens, pray and intercede for them for the Lord's sake and ask Jesus to have His perfect way in their lives. In fact, if you have not felt the need to spend time in intercessory prayer for God's will in their lives, I don't think preaching to them will be effectual, do you? Ask the Lord exactly what He instructs you to do. But instant messenger services and secular chat rooms are usually operating under anything but the Holy Spirit's leading.
I think it's honorable and right that you have a desire to see these teens come to Jesus, Sister Hailee. Just remember to pray and seek the Lord's instructions first. Blessings of grace to you, dear!