If you are a junior, you have this entire year and half of 2019 in high school. You need a stable home environment for the next 18 months. You might really need to move slowly on the disassociation thing. Life at home as a JW might be miserable, but life at home as a DA'ed JW could be worse than barely doing the minimum. I know that, to a seventeen year old, that seems like "forever" but it really isn't that long.
And I know it's tough to have all kinds of people in your life who are JW's and contemplate losing their friendship/contact. Before such a thing happens, you have to have a chance to develop outside friends. If you think 18 months of pretending is long, it is going to seem like an eternity if you are severely restricted all the time and have nobody talking to you among the people you are allowed to be around.
This is the link to the 4th Annual Midwest Apostafest- a gathering near Indianapolis in the summer of 2017:
https://www.facebook.com/events/381343342244843/