What should I do?

This is about what happened today in school: one of my friends told me that I should not preach the gospel to them and in the entire and I said ok, I will not. He is a Christian but we have one friend that is a Muslim and the other friend said to not disrespect religions, respect them and I said ok. Should I not preach at school and help them with God but only pray for them or preach to them. BTW they have already see the gospel months ago because I sented to them the good news in a form of a paper. So they already know it. And also, how do i make my family to know the good news because they don't know and I'm sure that they don't like and they don't care about God and God related, just living their lives till they die without caring where they will go. One final question: how does one know that he has lust or lust addiction? Thank you for reading this far, Jesus loves you and yes I preach the gospel on YouTube in comments.