I'm terrified and always will be.
You should watch this video , its short. Also you should search Alan Watts on youtube and listen to his lectures , they might help you a lot.
Things to consider when you fear death:
1. The Universe is 13,8 billions old, for most of that time you weren't even alive.
2. If you were to live forever you'd get extremly bored with life , you would experience everything for infinite times. You would have seen and done everything for infinite times. Life would eventually wear you out mentally knowing that there is nothing more to experience. Theres no new joy to be had.
Imagine having 1 mil children during your life time. The first few children would give you an amazing feeling but after the 450th child you would start to feel nothing (or rather much sooner). You would feel like an insomniac begging for some sleep, you'd beg for death.
3. People fear death mostly because they don't know what happens after, its fear of the unkown. But we know that we came from somewhere (into existence) , we came from that unkown , so it can't be all that bad.
Its all sounds like a cycle : you come from non-existence -- you live -- you go back to non-existence. There's really no reason for fear.
4. Let's assume that when you die it all just ends , no more happiness , no more joy so on. At the same time all the negative experiences will also end , no more pain , suffering , frustration so on. Wouldn't you consider it a fair trade ?