"Don't worry, be happy," so goes the popular song from way back. Indeed, why worry? Usually, worrying stems from living in the past, trying to prevent future regrets/mistakes from happening again, or even concern with what the future may bring.
For you to stop worrying now, you need to:
1) Stop living in the past:
We’ve all made mistakes, misdemeanors, regrets, follies of our youth, etc. It's already done and in the past. There’s nothing you can do about it now. It’s time to move on. What you can do now is to learn from the experience so you can do it differently next time.
2) Stop worrying about the future:
To stop worrying about the future is to realize that you can't predict what will happen tomorrow or the day after. Still, it's important to note that in almost all areas of your life, you are in control of your own life. So stop blaming the outside world for your own woe--like other people, the traffic, the government, the weather, etc. Believe that in your hands lie the power to choose how to act or think.
3) Choose to be happy:
In order to be happier and less worrisome, just choose to be happy! Too often people think that they need more stuff to make them happier. But actually, it's so much easier to do it the other way around. When we choose to be happy, then things fall into place. Today, make a list of the things you're grateful for, or the great things that have happened to you. Yes, it can be all the small things; like the food that you enjoyed, bonding with friends, being healthy, a sincere compliment you received. There is so much to be grateful for!
This is a life worth enjoying. So start living, stop worrying, and enjoying your life!