Scared to die, scared of death?

well, this is complicated for me. :/ Now I've already heard people tell me 'You shouldn't be afraid of death, its unavoidable' and 'Its like sleeping forever but you have no dreams'. You would think that would comfort me but no, it makes me even more afraid what lies ahead of me. I'm only 15, but I have contemplated death many many times, and each time i would come to a different conclusion. I either accept the fact that everything is pitch black after death and thats the way it is, or i just lay there on my bed thinking about the things that comfort me the most (for me, its the thought of there being an afterlife). I know death is a part of life, that its same for every human being. But I don't like thinking about it the way atheists do. I don't know how they/you guys came to peace with eternal darkness, but i know for sure that i will never be able to come to peace with that. I want your opinons, your tips and your advice. :I By the way, I do believe that there is something after life, that we don't just exist for a while and then stop existing. I believe we're here for a reason. I'm the type of person who likes to think about the future, about whats going to happen. I like to plan things out, and not being 100% sure about what happens after death has been scaring me. :II Any advice?