You only get one shot at every minute of everyday.the best thing to do is to truly maximize on each moment,because the reality is that time doesn't stand still all you have is the here and now to live and mend the wrongs made in the past and strive for a better future. However it's what you do now that guarantees your tomorrow .
The biggest mistake we make , is we want to get to various milestones set in life thinking we will feel happier or get a sense of fulfillment that we forget about the present time .
A good example is when you re so eager to turn 13,so you can be called a teenager .Then when you do .Those two years fall through the cracks because, you were counting down to when you get to sweet 16 .Which comes and passes and the anticipation for 18 begins because,you will receive a lot more freedom . However your truly legal when you turn 21,and when you get to 21,you realize how much you let get passed you.As a result of wanting to be older and treated like an adult .When you realize it's not as exciting as portrayed, and you wish you can have it all back for a moment.
After all your only young for a short while and the freedoms you thought you were missing out on will be there forever but childhood is only so long.
Or in the case where your watching a newborn,and you wish they can sit up on there own then ,walk on there own,then they do all that and soon there talking playing and starting school ,at that point all you have left all are the memories of the past and the what if I was more patient and let nature take its course.
If you don't believe me write a letter to your past Self and watch it actualise I front of you.
So if you have now seen that you have been hurrying through life ,you can't go back and change your actions you just have to work with the here and now and start enjoying each moment.your current reality is what it is because you've gotten it there.ups and downs make us better stronger versions of ourselves.
I always say don't cry when your down fight your way up.then laugh when it's done because you are better for it.
Live,laugh,love and learn from each moment in your life and see you become a better version of yourself.