"This is a form of physic talent. A trick I learned. When someone steps or tries entering your mind. Key element is YOUR MIND. You are king, queen, god, In YOUR own head. Your not weak only when you think you are can they enter. If you feel them picture yourself constructing massive walls around yourself in your head. If you want style create guard posts in your wall. Its your mind. If you want to create guards its easy think it so an done. The mind is a powerful thing. Imagination comes in hand when protecting oneself mentally."

"I am not sure if this would help, but at least with my mind, not sure if it is the same for every mind, I have a section of it that is like a constantly shifting labyrinth that can protect/trap those who enter. In theory even if you got trapped there you would still be able to function in everyday life, but it would be hard for others to get to you. The downside of doing this would be your mind can't interact with others even if you want to. (but it should still control your body)
If you want to try, how you enter is imagine a great big entrance, now think of protecting yourself from insanity while at the same time it being your protection. Now enter that doorway thinking that is what it shall lead you to. Once your in the only way out is to see threw the lies in and focus on your goal of exiting without being swayed.

I wouldn't recommend what I just suggested to do, but in a worst case scenario you could try it."

"Well, I kinda was forced to learn a bit about it by doing. But what I was trying to describe traveling to a part of one's own mind which essentially is a fail-safe shelter, or at least I think it is. The reason why I don't recommend it is that when in there it is hard to get out, and if you are in there you can't enter another's mind with out leaving. So, if you ever need to enter another's mind and you don't know how to get out of that thing, you blatantly can't if I understand things properly."

"What I use is a wall. I imagine a wall. If someone is trying to force themselves in, I use the flexibly wall and push at the force. (or stab them with an imaginary knife.) Its quite easy to get into peoples' heads, expecally if I dont mean to."