Answer:
Yes, many people feel this way after graduating from high school.
It can be a difficult transition from the structure of a school day to having to figure out what to do next.
The feeling of not being smart or feeling useless is not uncommon, and it is important to remember that your self-worth and intelligence do not depend on grades or the opinion of others.
It can be helpful to talk to someone you trust about how you are feeling and to come up with a plan for the future that feels manageable and exciting.