Formal:
* Je veux m'échapper. (This is the most literal translation)
* J'aspire à m'échapper. (This implies a strong desire and longing for escape)
Informal:
* J'ai envie de m'échapper. (This implies a desire for escape, but not necessarily a strong one)
* J'aimerais m'échapper. (This is a polite way of saying "I would like to escape")
* J'ai besoin de m'échapper. (This implies a strong need for escape, perhaps due to stress or pressure)
More nuanced options:
* Je rêve de m'échapper. (I dream of escaping)
* Je voudrais fuir. (I would like to flee)
* Je me sens prisonnier et j'ai envie de me libérer. (I feel imprisoned and want to be free)
The best way to choose the right phrase depends on the situation and the emotion you want to convey.