My Dad gave a lecture a few years ago when he said that the Chinese word for crisis is the same as opportunity.
Things happen in life. You can have an interpretation of the past, an occurrence or experience that may be negative. It may have a poor outcome, you may see it as a mistake. You might regret it. Perhaps it was a bad experience. You may have disagreed. It could be an unresolved issue. Something you didn't want and it scuppered your high expectations.
So why not have a revised view of the present and future? You've an opportunity to blossom. You can be very specific about what you want. Be realistic, do something you can achieve. You can change the situation, alter your expectations maybe. You can change direction and have new experiences. Above all , ENJOY.