Is there a word for 'nobody likes me' syndrome?

Is there a word to describe nobody likes me feeling?

What would be appropriate in the following cases?

I am suffering from ______.

Or

I feel ______.

If you are experiencing this feeling, you may feel like an outcast. Definition:

A person who has been rejected by society or a social group.

Example:

No longer could gays and lesbians be treated by society and by the law as outcasts, a marginal and disposable fringe.

The word can also function as an adjective. Example:

The smaller child was made to feel outcast.

Synonyms:

pariah, persona non grata, reject, outsider, leper, black sheep, red-headed stepchild

If you are experiencing this feeling, you may have low self-esteem. Definition:

Confidence in one’s own worth or abilities; self-respect.

Example:

We provide assertiveness training for those with low self-esteem.

(Oxford Dictionaries Online: outcast, self-esteem)

If I'm feeling mopey, I'll mutter under my breath "guess I'll go eat worms", referring to the popular kids song "Nobody Likes Me (Guess I'll Go Eat Worms)"

Mopey might be a good word too. oxforddictionaries.com:

Be dejected and apathetic

Eyeore from Winnie the Poo is described in Wikipedia as suffering from Anhedonia, which is essentially the opposite of hedonism.

I am suffering from paranoia. I feel paranoid.

Definition at Cambridge.org

 ​paranoid: feeling ​extremely ​nervous and ​worried because you ​believe that other ​people do not like you or are ​trying to ​harm you.

But when on the subject, consider ...

"Just because you're paranoid doesn't mean they aren't after you."-Joseph Heller in Catch-22