Do this for a couple weeks (it's free for 2 weeks), see if it helps:
https://www.mytherapyjournal.com/
After that it costs but it's very inexpensive, only $35ish a year. If it helps you in 2 weeks you might be able to figure out how to just get a free private blog somewhere online and continue
Write In Private: Free Online Diary And Personal Journal | Penzu