Are you allowed to have time off if you don’t do enough revision?

I’m trying to revise but it’s not going well, I think I have ADHD or something. I really really really want to revise but my brain won’t let me. It’s exhausting, and my parents are always angry at me (which I know is valid and I am in the wrong). My main concern is whether I should still partake in my hobbies or whether I have to earn things like that? I know you should give yourself time off when you study but given that I’m not achieving anything and spend my study time staring into space, doomscrolling or overthinking everything does that mean that that doesn’t apply to me? I have to do physiotherapy for my back, which hurts if I don’t do it, but that takes about forty five minutes out of my day and I could use that time for studying (not that my brain will allow me) so should I just suck it up and deal with the pain? I want to go to town to visit my grandad on the weekend, is that something that should be allowed? I really feel like I need to get out of the house to somewhere that isn’t college (I don’t really have a social life lol) but do I need to earn the right to do that? I’m not sure whether my parents will let me go, but are they being too strict or do I deserve to be punished? Do you need to earn the right to partake in nice things? I don’t really understand what the general consensus is on things like this, I seem to constantly get given conflicting messages and opinions. I’m so exhausted.