A little worried about shirk
Assalamu alaikum, I guess this might be asked a lot, but I need to get it off my chest. I'm Christian, and I've always tried to respect everyone, but now I'm scared about shirk. I've been following a different faith my whole life, and the thought of eternal punishment really frightens me. Does Islam really say that if I learn the truth and still reject it, I'll end up in Jahannam? Sorry for the question, I've just been really anxious.