I mean, on paper it's allowed, but I personnally don't think it's wise.
I get that you want to call for help and empathy and for someone to read and understand how you're feeling. That's normal and usually a sign that you do need to talk to someone. That someone should be a friend, a therapist, a close family member, or an internet friend over SMS, someone you feel comfortable with and who has your back. You could even write it down in a journal and illustrate it. Get your catharsis somewhere you are safe and the people are good.
The internet can be horribly cruel, and if you post your unfiltered thoughts online, especially the ones that are deeply personal and traumatic that you won't necessarily be able to express clearly to others, bad actors and people who wish you harm will use that against you. Other hurt people could lash out too, trying to push you down so they can feel better in comparaison. If someone irl doesn't like you and finds your writing (trust me, it's way easier than you think even if you separate your tapas account from any other social media and your real name) it can very easily be weaponised against you.
I'm not saying don't talk about your struggles, please do. Get that storm out of your head and on to the page, it helps. Even on tapas there are truely heartfelt stories that are beautiful and moving that are born from experiences similar to yours, but the authors have taken a step back to digest it and express it in the best way they can to protect themselves. I worry that if you post raw emotion, you won't have any skin to protect against feedback shooting straight through your heart.