Worrier (noun)

A person who worries or frets excessively or habitually.

Origin:

Worry + -er.

Examples:

1. She was a worrier and couldn't help but worry about everything.
2. The worrier was constantly worried about the future.
3. Worriers often feel anxious and stressed, even when there is no reason to be.
4. He was a worrier, and he constantly worried about the safety of his family.
5. The worrier was never able to relax and enjoy the moment.