I can relate to how you feel in many ways, I have many fearful feelings of death, not because of the actual dying in many ways, but the things I may miss out in life and how it would affect others. In terms of death, it is best to come to terms with it rather than blocking it out, as it will simply reappear as a similar feeling when you have time to reflect. At the same time, it is always best to involve yourself in other things to prevent yourself from constantly thinking about such extreme elements of human life. For me, I have come to terms with it by accepting it as a natural element of human life - with out it, the planet would overpopulate and suffer. Also, while I would wish for eternal life, such life could lead to phases unknown to humans of today, and most likely madness - when you are old, your outlook on life will change, and most likely be more wearied, and death will be an end that you will not even realise. There will always be times when you are afraid, don't worry about that, but if you can think about death in a less threatening and fearful context, then things should become easier.