The sort of person I get so worried about (6)
I believe the answer is:
egoist
'the sort of person' is the definition.
'i get so worried about' is the wordplay.
'worried' indicates an anagram.
'about' indicates putting letters inside.
'get'+'so'='getso'
'getso' is an anagram of 'egost'.
'i' put inside 'egost' is 'EGOIST'.
(Other definitions for egoist that I've seen before include "It goes with self-centred man" , "Self-centred person with a swelled head" , "A self-interested conceited person" , "self-seeking type" , "Self-absorbed person" .)