I want to leave this place.
I don't quite know what you mean. 'Quand tu veux' means 'when you want', which doesn't fit with the rest of the question.
"Je veux etre....
"Je veux vas te faire encule si mal" is broken French mixed with abuse. It translates roughly as 'go f*** yourself"
'Je vous veux me tenir'
the French part of the lyrics are 'je veux ton amour et je veux ta revanche je veux ton amour' That French part of the lyrics is just a translation of part of the English text ('I want you love and I want your revenge I want your love') There is no other special meaning that making the lyrics a bit more fashionable by turning part of them in another language.
Want.
quand tu veux means 'whenever you want' in French.
"Je ne veux" in French translates to "I don't want" in English.
I want
it means I want you in french
want to speak french
You can say "Je veux me battre avec toi" in French to mean "I want to fight you."
'je sais ce que tu veux dire' or more standard: 'je vois ce que tu veux dire'
Qu'est-ce que tu veux ? means "What do you want?".
Qu'est-ce-que tu veux dire ?
Je te veux mienne (a rather literary expression) means 'I want you to be mine' in French.
I want to be a lawyer in French is 'Je veux devenir avocat' or 'Je veux devenir huissier' or 'Je veux devenir notaire'.