Your English (as shown in your comment) is more than good enough, but I don't know how much effort it took for you to write that comment.
It sounds as though those racing thoughts are at least partially habitual. The only way to find out whether they are in fact redundant is to try posting-- and maybe even to ask whether a post you're unsure of is contributing anything new.
Some research says that lurkers make up over 90% of online groups. I suspect that Less Wrong has an even higher percentage of lurkers than other online communities.
Please post a comment in this thread saying "Hi." You can say more if you want, but just posting "Hi" is good for a guaranteed free point of karma.
Also see the introduction thread.