How do you mean lost? Perhaps they have lost their way, but by the grace of God they may find it or be found.
I pray for all young adults, and teens too, that the Holy Spirit may guide them always toward faith, hope, and love.
I pray for you as well. Don’t give up! All things are possible for God.
It’s your first year of college, right? Freshmen tend to bust loose with new liberty and new temptations. In a year or two, some of them will realize it’s not all good and they will be forced to rethink. You don’t have to force anything. Leave that up to the Holy Spirit. Meanwhile, set a good example, be patient and kind, and let your light shine in the darkness. When they need that light, you’ll be there. In some cases they might come to you. In other cases you might not even be aware of the good that you are doing for them. God bless you.