Cant write what I want to

I tried writing this a few times over the past couple days but I was having trouble but thats kind of the point of this post.

I dont talk very often out loud (unless its about my special interest and im with people im comfortable with) but online I can write wayyy more. I usually even annoy people with how much I write when I text/email/etc but the last couple days I keep trying to comment on things on here but I changed my mind and didnt send it. I think I only made 4ish comments and they were pretty short than my usual. I dont know why I cant write right now, its like I dont feel like it, mixed with I cant find the words I want. I was just wondering if anybody else has had this before and if theres a way I can get past it?