You have everything you need (and more to gain)
The problem is that we were taught to strive for achievements. Carreers, and money, and stuff. It is a problem because it is never enough. It is like an eating disorder for success; we can't get enough of it, simply because it isn't really satisfactory. It is also a problem because human life is extremely fragile and tends to end easily. There are the forces outside to threaten us (like that car you never saw coming, or a freak accident involving electricity, or dying in a fire) and inside (the heart growing weaker, blood vessels clotting, the aberrant cell that starts growing in the dark). In such a situation, where you have something meaningful that could end at every minute, you'd better make the best of it. Postponing anything is probably not a good idea.
So instead of giving yourself entirely for what you have thought to absolutely need, you should also start thinking of what you want from life. But not only about how you can enjoy it, but what's your role in it, actually? How many of your achievements are only for your own benefit? I think the magic starts to happen when we start shifting our focus from what we can achieve for just ourselves to what we can achieve for others, ourselves included. We were not made to be martyrs, clearly; that would be an evolutionary waste. But if we can start looking out for each other, that can only make us healthier social beings. And maybe questioning our goals like this can lead us to being a different version of ourselves, realizing that if we're ever to change, we'd better do it now. While there is still time.