how totally awesome of the Lord to give you this inspiration to save your friends.
When i was in school, (2 decades ago) i still remember the night i asked a friend on the internetif he wanted to go to church (i was in the band). that was the first and last time i asked anyone, and i regret my shameful dorkiness every day.
You feel some guilt and that means that Christians around you are great Christians. I suggest you persist, your friends can't shoo you away if you ask once a month or once a week on friday.
If they come to church, then ask the priest to give them a free bible.
but be assured, if you study calculus at school, you will understand the dimensions of Genesis chapter 1. The same dimensions that engineers and architects use to build stuff, physicists and mathematicians use to define where stuff is. spatial dimensions and temporal dimensions.
pray every day all day, even for the smallest dumbest smartest thing, the Resurrected infinite Lord Jesus truely hears quiet prayers in the mind(