I'm sorry you feel this way. Death really is inevitable, but life is only meaningless if you think it is and treat it that way. My life isn't meaningless to my family, to loved ones I share memories with, and to people I've helped along the way. Or did you mean that life itself is meaningless (or rather: empty if you like), and that you have to make something out of it yourself?

If you had truly come to terms with death and believed life is meaningless you'd be unable to even so much as go to the bathroom. More likely, you've tricked yourself into thinking these things.