Glad to hear that things have calmed down in your household.
For your own peace of mind, however, I would recommend that you consider contacting your ‘safety’ school via email, and let them know that you’ve changed your mind and would like to be able to keep them in consideration.
Ask them directly if you can reverse your decision, and request that they reinstate your offer.
While you hopefully will be able to win your parents over to seeing GT for all that it is and not need to consider your safe school, for your own mental health in the weeks to come, it could be a way to allow you to be a lot less anxious.