Alone

a·lone
əˈlōn/
adjective & adverb
adjective: alone; adverb: alone

1.
having no one else present; on one's own.
"she was alone that evening"
synonyms: by oneself, on one's own, all alone, solitary, single, singly, solo, solus; More
unescorted, unaccompanied, partnerless, companionless, by one's lonesome
"she lived alone"
antonyms: with others, accompanied
without others' help or participation; single-handed.
"team members are more effective than individuals working alone"
synonyms: unaided, unassisted, without help, without assistance, single-handedly, solo, on one's own
"he managed the store alone"
antonyms: with help
isolated and lonely.
"she was terribly alone and exposed"
synonyms: lonely, isolated, solitary, deserted, abandoned, forsaken, forlorn, friendless
"Klein felt terribly alone"
antonyms: loved, wanted, among friends
having no companions in a particular position or course of action.
"they were not alone in dissenting from the advice"
2.
indicating that something is confined to the specified subject or recipient.
"we agreed to set up such a test for him alone"
synonyms: only, solely, just; More
and no one else, and nothing else, and no one but, and nothing but
"you alone inspire me"
used to emphasize that only one factor out of several is being considered and that the whole is greater or more extreme.
"there were fifteen churches in the town center alone"

Nothing was worse than being alone at the end of the world.. and that's exactly what I was... Alone.