fusspot:
(also fussbudget; plural: ‘fusspots‘; pronunciation: the letter ‘u’ rhymes with the letter ‘u’ in “but”)

a typical old fusspot?
a very fussy person;
a person who is very difficult to make happy and always complains about silly or unimportant things;
a person who always thinks/worries about unfortunate things that might happen,

a pouty fusspot with her parents trying to appease her
My granddaughter used to be a fusspot and never relished her food though she looked hungry all the time, and eventually, she started to eat foods she liked most and we were too eager to give her whatever she wanted.
Psychology experts say that there are professional fusspots who worry more than the need to and over a period of time they become so paranoid that they hate to continue their profession.
Most relations fail at an early stage because either of those two or both of them involved in a relationship show signs of being fusspots and that impression naturally discourages both of them.
