A lot of already great advice here, often clarifying that a computer that is not yours... is not yours.
What I would still add though is that you are NOT, and I'm very confident in saying this, the only one there, in your very school, to ask that question. In fact I would argue MOST users have the exact same concerns but they might even be aware that alternatives exist.
So... do not push back, or even just avoid, all this alone. Find others who have similar problems and solve them together.
There might be a Linux User Group already, join them. If there isn't one, consider making it. It might just be you for few weeks, even month, but at least you will dedicate time and space to improve YOUR situation. Chances are though that others, even if only curious at first, might check what you are up to, if they can replicate that, etc.
Don't feel isolate, move the needle for yourself first, in your corner, but be welcoming to others who are eager to contribute.
It's a challenge, but it's a fun challenge while trying to tackle it with others.