Fear of death

So recently I’ve been getting really scared about dying. I’m only 14 but it really stresses me out thinking about it. Like I know God is probably real, and if I’m good I could hopefully go to Heaven, but I’m someone who always try’s to think logically, and there’s always a thought in my mind like “what if he isn’t real? What’s after death?” And it scares me beyond words. I know that sounds over dramatic as hell but it’s how I feel. Anyone got any advice?