@imogen1234,
This is just my perspective, but...
You are indeed fortunate to have parents who care enough about you to do their best and teach you important life lessons. And strong enough to enforce the parameters they set.
Think now -- your parents sacrifice their own freedom to ensure you remain true to your remedial reflective and learning period (it doesn't seem like a very severe "punishment" to me, though that's the term used).
Your parents haven't beaten you, disfigured you, drugged you, or starved you. You're restricted to your nice, comfy, quaint little bedroom, not chained to the basement floor.
Your parents haven't cut you off from society. You still go to school and have the school week during which you can talk to and be with friends. Maybe you can now try to choose a better class of friend over any who will "dare" you to steal for them...?
Your parents haven't taken away all your privileges on a 24/7 basis (you still have access to Internet, phone, TV, etc. during the week).
Best of all, they haven't simply sighed and allowed you to do whatever you want, regardless of your safety, age, and total lack of life experience.
They simply took away your "fun time" so you can reflect on the life-path on which you took the first steps when you decided a friend's "dare to steal" (and later drink) a bottle of hard alcohol was more important to you than the law, your personal safety, and your parents' guidance.
My advice (again, just my personal old-man perspective) is to stop whining and acting like an entitled Karen with a slightly-chipped nail, and apologize sincerely to your parents for endangering your life, breaking obvious laws, harming their relationship with the shopkeeper, and lowering your standards to the level of a common lowlife thief.
Tell them you can do better than that -- and then DO it.
Thank them for being so understanding, and stop crying about other people legitimately enjoying their weekends ("They're having fun just because THEY didn't steal or break any laws! Not fair!"). Stop soliciting sympathy and commiseration, suck up the 4 restricted weekends you got, hit the school books, and aim toward maturing through this.
I may be just slightly off the mark with some of the above, but I think what I write points in the right direction -- and is preferable to applying thumbscrews.
And I believe in my heart that at least 2 or 3 readers out there want to say something, maybe even more fiercely, along the same line...
It is probably the weekend where you are, so you won't read this until Monday (bright and early). Start it off right.
Have a reflective, growth-oriented week.