A paper-only journal would defend against the state, but not against people you live with. A digital journal can be encrypted, but an intelligence agency could potentially gain access (like, them reading your anti-government rants that may involve violence… that sort of stuff).
So… how to defend against both threats?
(Also, I just realized, paper journals cannot really be easily backed up…)
When I was a teen it wasn’t the government I was afraid of, but digital devices were just as likely to be read as paper. What I did was keep anything I needed to be private at school, work, a friend’s. Is any of that an option? Would a super old laptop with a fresh OS that you never connect to the internet be safe in your home?