Life is not short.

Going through Seneca's words...
On the Shortness of Life

"Putting things off is the biggest waste of life: it snatches away each day as it comes, and denies us the present by promising the future. The greatest obstacle to living is expectancy, which hangs upon tomorrow and loses today. You are arranging what lies in Fortune’s control, and abandoning what lies in yours. What are you looking at? To what goal are you straining? The whole future lies in uncertainty: live immediately."
(...)
"No one will bring back the years; no one will restore you to yourself. Life will follow the path it began to take, and will neither reverse nor check its course. It will cause no commotion to remind you of its swiftness, but glide on quietly. It will not lengthen itself for a king’s command or a people’s favor. As it started out on its first day, so it will run on, nowhere pausing or turning aside. What will be the outcome? You have been preoccupied while life hastens on. Meanwhile death will arrive, and you have no choice in making yourself available for that."
(...)

How can we engage in a real fruition of Life?

"You must match time’s swiftness with your speed in using it, and you must drink quickly as though from a rapid stream that will not always flow… Just as travelers are beguiled by conversation or reading or some profound meditation, and find they have arrived at their destination before they knew they were approaching it; so it is with this unceasing and extremely fast-moving journey of life, which waking or sleeping we make at the same pace — the preoccupied become aware of it only when it is over."
(...)

And for those who complain that they had not the same opportunities as others, here's a smart reply:

"We are in the habit of saying that it was not in our power to choose the parents who were allotted to us, that they were given to us by chance. But we can choose whose children we would like to be. There are households of the noblest intellects: choose the one into which you wish to be adopted, and you will inherit not only their name but their property too. Nor will this property need to be guarded meanly or grudgingly: the more it is shared out, the greater it will become. These will offer you a path to immortality and raise you to a point from which no one is cast down. This is the only way to prolong mortality — even to convert it to immortality."