Ask yourself what your motivation is behind the second guessing. Is it a general sense of imposter syndrome about writing your character? Perfectionism over tone or sentence structure? Just anxiety about hitting the 'post comment' button?
That said, as a former(ish) tag overthinker I think the thing that cured me was having a thread partner who wrote me imperfect tags for a thread I was really thirsty for lmao. Don't get me wrong, their writing was excellent but there were always the odd typos and occasional wonky sentence structure... and I realized I didn't give a shit because I was enjoying our thread so much. So I just cut loose with worrying about my own typos and writing weirdness and focused on tagging back faster, because my writing partners probably would rather have my slightly wonky tags 2-3 times a day than once every three days after a lot of polishing and editing.
Re: ASK ANON
That said, as a former(ish) tag overthinker I think the thing that cured me was having a thread partner who wrote me imperfect tags for a thread I was really thirsty for lmao. Don't get me wrong, their writing was excellent but there were always the odd typos and occasional wonky sentence structure... and I realized I didn't give a shit because I was enjoying our thread so much. So I just cut loose with worrying about my own typos and writing weirdness and focused on tagging back faster, because my writing partners probably would rather have my slightly wonky tags 2-3 times a day than once every three days after a lot of polishing and editing.