Alone time, social isolation and loneliness are different
The CDC distinguishes social isolation—limited relationships, contact or support—from loneliness, the feeling that meaningful connection is missing. Someone can have many friends and still feel disconnected. The difference matters when deciding what kind of connection you want.
The Myers & Briggs Foundation describes E/I as a preference about attention and energy. That model description is not a measure of loneliness, friendship quality or how much support you have. Neither an I nor an E code establishes which experience applies to you.