Reading and Watching TV doesn't improve my vocab because of Learning disability, what to do?

I’m a quiet guy. No friends. i’ve never had friends. I’m early 30’s now. When i meet other Americans( well, mostly see them from a distance) and see how they talk, it’s pretty incredible to me. They know so many words and expressions and stuff. Same with people in TV. And then they are fluent and don’t make pauses.

When i try to talk.. i’m stuck always cause i don’t know words and vocab and expressions. My brain is slow. Even if i have a word at the tip of my tongue, i just can’t remember it.

I read books, watch tv, speak to myself for practice, and nothing seems to work. As you can see, i’m not even good at writing, . I just use basic words and often use the word “stuff” and “things” because i don’t have words to replace that.

At work, i talk with some coworkers…but i struggle big time. I can’t keep up, and i’m slow and i can’t think.

HOw the heck do i learn how to speak better and learn new words and expressions?

Then, there’s stuff that even if i study i can’t comprehend. The people who send documents never explain terms in a simple easy to understand way. For example, things about taxes, finance, loans, ..

And the problem with Asking other people is that most people who are good speakers, explain things in the way they and other talkative people would understand. They never explain it in a childish simple way, which is what i need. I need drawings and simple explanations.

It’s the same thing with dictionaries . Dictionaries give definitions in a way that only good speakers would understand.