If you feel this way most of the time, you are probably depressed. Have you seen a doctor? There are medications and therapies that can help you to deal with depression so that it does not consume your life.
Are you just worried that you are not doing what “everbody else” (whoever they are) is doing? Constantly comparing yourself to other people is a fruitless pursuit that mostly leads to anxiety.
Are you a nice person? Do you donthings to help others? Volunteeeing your time to others, whether it be through an organized volunteer organization, or just by finding out what needs to be done in your own household, your own extended family, your own neighborhood, your own city, or your own country, or on your own planet, will keep you busy, and will be helpful to other people, and will give you less time to fret about your “what ifs”.
Find something that needs to be done, then do it. Offer to babysit your friend’s kids while she is at the doctor or needs to go shopping. Offer to walk your neighbor’s dog because they work long hours. Offer to clean your elderly neighbor’s house or mow their lawn or drive them to their appointments. Organize a “food train” for someone you know who has lost their spouse or who is going through medical treatments and can’t cook for their family, find out when and where the next community cleanup will be and then help clean up trash, and clear brush, help with fund raising at your neighborhood school, make some cookies or a pie for a homebound neighbor. Get the word out and help to register people to vote, and arrange transportation to the polls.
Find out who needs help around you, then get busy. You don’t have to be rich or the belle of the ball, you just need to be helpful.
Ladder climbing isn’t the key, being useful is.