Introductory.

You're saying that you're a Grammar Nazi, yet you've made an error in the first sentence of your introduction.

Hello, I'm Psychosis. I've joined this forum to meet it's intelligent community, and to share with it my thoughts and ideas. Many others consider me very Intelligent and smart, I learn very fast. People are very convinced.

its*
intelligent*, does not take a capital I.
And if people think that you're intelligent, it does not mean that you are intelligent. People might be wrong.

Nevertheless, welcome.

EDIT: Actually, you've made more than one error.