uptight

She is always uptight before exams.

He tends to get uptight when things don't go his way.

Try to relax and not be so uptight about everything.

Her uptight attitude makes it hard to have a conversation with her.

I can't stand being around uptight people.

He comes across as uptight and unfriendly.

She needs to learn to loosen up and not be so uptight all the time.

Don't be so uptight about making mistakes, everyone does.

His uptight demeanor makes it hard for others to approach him.

Being uptight all the time can take a toll on your mental health.