I love life and I don't want to die. How to let go?

The last few days I've been struggling with the fear of death. I really love life and I fear the unknown. I know it's inevitable but for some reason I can't accept it. I find it beautiful how in buddhism people actually want to achieve nirvana. I mean I know there's no suffering but also there is no happiness etc. I would love to hear some tips on how to accept the inevitable and enjoy the here and now more. Mindfulness helps a lot but sometimes the thought still jumps into my mind.