alone
abandoned, apart, batching it, by itself, companionless, deserted, desolate, detached, forlorn, forsaken, friendless, hermit, in solitary, individual, isolated, lone, lonely, lonesome, onliest, only, shag, single, sole, solitary, solo, stag, traveling light, unaccompanied, unaided, unassisted, unattached, unattended, unescorted, unmarried, widowed
I know this feeling all too well.