My life is passing me by

Sometimes, when I look outside, especially with nice weather, I feel like crying, because my 34 year old life just passes me by and nothing special ever happens to me (without a partner) and I think it will stay like that until I am 40 and then the best years of a woman are over.

And all those years I spend meaningless. Others have a partner and there is progress in their lives (children are growing up) and with me everything stays the same. I always stay in the same phase. And then I wonder what's the use of this life when you live it just as an observer...