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?
My life is definitely meaningful on a micro level i.e. to my close family and friends and I owe them enough to have certain parts of my life actions and direction influenced by them, but in the larger picture over thousands of years, my life is pretty much meaningless.
Which means I obsess less and less over what others think, I compare myself less and less and I let things that I can't control influence my happiness less and less. Basically I'm a nihilist.
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.
Most people would be depressed with this epiphany but for me, it was liberating.