Is there a word to describe the feeling of wanting to be someone else

Is there a word that describes having a deep desire to have a different life ( because the current life is bad), or a word that describes a longing to forget the past or just forget everything in general?

I think escapism would do for me. Becoming more popular too these days.

One possibility is dysphoria:

NOUN

Psychiatry

A state of unease or generalized dissatisfaction with life. The opposite of euphoria.

EXAMPLE SENTENCES

Post has suggested a clinical continuum of euphoria, dysphoria and paranoid psychosis that occurs with regular cocaine use that is related to dosage, genetics and previous exposure.

Researchers found that sociotropy and negative affect were nonspecifically and positively correlated with both dysphoria and anxiety in 485 undergraduates.

There is, in fact, evidence that benzodiazepines are of greater benefit when used to treat either patients with moderate to high levels of anxiety or dysphoria.

Origin

mid 19th century: from Greek dusphoria, from dusphoros 'hard to bear'.

Derivatives

dysphoric

Pronunciation: /-ˈfôrik/

ADJECTIVE & NOUN

EXAMPLE SENTENCES

In addition to a general level of irritability, children with mania also present with extremely impairing dysphoric, explosive episodes that generally occur daily with little or no precipitant.

‘The implication for treatment is that if you ask dysphoric people to recall nice events from their lives it may not make them feel any better,’ Joormann notes.

Although the average depression lasts around six months, those with severe major depression or constant dysphoric depression may have symptoms that last for years.

(Definition and examples from Oxforddictionaries.com)