Time for everything IS running out. And no, there's no roadmap that shows you how to stop feeling lost. I'm 52 and that feeling becomes ever more intense. I wonder how I got here so quickly. I'm told THAT feeling intensifies at 70. That said, the way I deal with it is to accept. I accept my age; the feeling of time's fleetingness; that I will cease to be (god/Jesus, Viracocha, Mandaeism, Zoroastrianism... are constructs that do little to overcome this feeling).
And so I live trying to being aware of each passing moment, and thinking about how I might better use the next moment. I have a personal web site on which I wrote down every major event in my life, and when I feel low I read that. I've achieved and done a lot. And I want to do a lot more. Mostly much more loving. In the both carnal and (obviously seperately) paternal senses.
I have hobbies I love - I did not pick one randomly because one should have a hobby, but because I truly love building those things. Creating something I recognise as beautiful is rewarding as f•••.
I also keep fit and healthy and take some pride in having lasted so many years without gaining weight other than muscle mass. I've done a variety of drugs, I've broken the law, and I'm ok with all of that because I think I've loved more people than I've hurt.
All these things... there's no meaning or other weird existential shit that comes of it. Other than being at peace with myself, my place in this fleeting existence, and enjoying as much of it as I can, while I can.
In parting, try sitting in a meeting and if there are women in the meeting, watch how men just talk right over them. And then interrupt those men, turn to the marginalised woman, and tell her you found her perspective interesting, and would she mind terribly repeating her thoughts. This is a probably hugely incoherent ramble about how I have learnt to actively try to get past what you describe. Some days are rough, most days amazing.