My advice would be: either don't sit with co-workers to lunch, or just sit with the people you trust entirely. It seems that your area of job is quite simple since they let people like your co-worker enter. So, I'd say: get something to do, start working at something, an intelectual task, print the exercises of another language or maybe revaluate data and do them while lunching or at "rest time". This is the über excuse not to talk to people. I call it "third party forces", since they are external to you, even though bound, you need to reach them, but the other person can't (in this case, you need to fulfill your task, the other person can't do it and disturbing your progress would mean error, defeat, and that would be the other person's fault). It has been doing wonders to me yet.

Sometimes that will be almost impossible. This controlling person would chase me all the time thinking I am a know-it-all that can teach him everything, so all the time he would bother me. Seriously, he couldn't perceive that he was being pushy, no matter how many times I told him that I didn't share his worldviews and that I wasn't very social because it's my nature, and he said "I will change you" (these words, really), "I see your mistakes, I just need to hone you, lapidate you". The 'mistakes' is that I like to be alone or studying most of the time. M8, seriously, how can a person say that to another? I just entered ghosting mode (didn't know this word at the time, discovered these days), but hell of a trying it was and trying to understand different human nature. I don't think he was a bad guy, but strangely egocentric that some people didn't perceive it (he liked to commend others almost all the time, but I saw that, at first glance, this was just self assurance projected towards the exterior because he needed external validation, since he would base his views so much on his history and not in a ojective approach, only to talk about his past experiences and try to apply this to a universal concept, like "this worked for me therefore is the truth and will work for you").

Also, as someone stated, you talk to him, this is an error. You need to be total alien to him. I know that people that feel me as alien think that I am a pretentious posh playboy prick, and that is not that bad, since that will keep them away, so they won't make moves to you (unless they are ESFx's). You just need to recover that wall of ice.

And people. People are important. You won't like to be at his side, but being alone can make you vulnerable to people passing by and trying to talk to you. Get someone to talk to, walk with and discuss work/other things so you can use them as scape valve.