My parents won't let me travel. I'm 20 years.?

So this summer I want to travel with my boyfriend, some of his girlfriends *we all get along* and some of his best friends (for 5 days). I have saved up money for this past month and everything is ready and all (flight, hotel..). My only problem is that I live with my strict parents (moving out this summer) and obviously as a good girl (20 years old) I don't want to break their rules and go without asking, but I really want to go. I just don't know how to say it, because they are very strict + they don't want to give me my passport *so I am stuck in this country*. I really don't know what to to. I got 8 weeks to decide :( HELP?
My parents won't let me travel. I'm 20 years.?
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