Learn to choose what is important for yourself.

The main idea that should be learned is that opportunities are always around and always will be. Opportunities do not depend on the day of the week or the time of day. Another thing is that from an incredible number of all sorts of interesting and diverse activities, you need to choose what you really like. It may be that you refused to go to the party, and then began to blame yourself for it. At this point, it's worth listening to your heart. Try to understand why you feel guilty and how you can help yourself.