Babe, I understand what ur saying but don't be hard on urself. Sometimes we can be too critical on ourselves. I also think if u feel uncomfortable having a conversation it's like u are worrying about what u say next to the point where it doesn't come out right. Not everyone can be as great as say someone u know who u think "has everything!" if u kno someone like that, just remember she doesn't have "everything" she has problems too. So don't think u are not smart enough. I think u are just like me and replay the entire conversation, over and over again in ur mind to the point of ridiculing urself over every single word. Don't stress too much and that person won't think ur stupid or dumb, they won't even think twice about it and carry on. I hope u understand what I'm trying to say as I feel like my stupid brain can't explain this.x