Fear of committing kufr

Salam alaykum, I've been very affected by the fear of committing kufr for over a year now. And the problem is that this is not only related to waswas but also to real acts, let me explain. I was born in a non-Muslim country and I'm currently a university student. I sometimes have to talk to non-believing students who make fun of religions and say very serious things about God. The problem is, I'm very shy, I hate contradicting others, I feel an embarrassment you can't even imagine. So I follow them in what they say reluctantly. I can't even fully reason when I'm acting like that, it's so difficult. Once this event is over, I end up repeating the shahada until another similar event occurs. Then I repeat the shahada again, and so on... It's happened countless times, and it's very taxing mentally. I would have loved so much to live in a Muslim country, none of these worries would happen. I'm really desperate. You can't imagine how scared I am of ending up a disbeliever when I don't want to, and ending up in hell forever. My questions are: 1) If an event similar to what I presented above occurs but I don't repeat the shahada, do I become a disbeliever? 2) If so, will I be in hell eternally even if I sincerely believe in the authenticity of Islam? May Allah reward you for your efforts