Why do some people refer to themselves in third person view? Like they'll say, "Bob likes that" instead of, "I like that."

I would like to know why I feel like crying when I speak to figures of authority. It happens most often when there is a serious subject to discuss; however, it has happened when talking about good things, too. It has happened when talking to my parents, grandparents, boss, and teachers. The common factor is that I see them as figures of authority and we are discussing me. I can talk with these people about anything else, but if we are talking about me, I begin feeling the urge to cry. I bite my tongue to distract myself. It is very embarrassing and uncontrollable. The most recent outburst happened when I was asked to describe my strengths and what I need to improve. I could feel myself wanting to cry, but it was still controllable by biting my tongue and speaking in short sentences. However, the teacher began using a soothing tone, asking what I thought because I wasn't saying very much. I was no longer able to control myself and cried. How do I stop this from happening and why does it happen? I am otherwise a very outspoken person and have no issues with public speaking.

As a 21 year old, I recognize that I'm far from being completely emotionally developed. But, I also recognize that I'm way behind others my age. I think I am too emotionally sensitive. Things people say or do really affect me. Whether I care about the person or not, I always have extreme emotional episodes after others express their feelings or opinions about me. If what they express is derogatory, I get very upset. If it's positive, I get very happy. And, I absolutely cannot deal with rejection. I want to be able to just ignore what others think and just deal with what I think. How can I achieve that goal?

1) My boyfriend, who I have been dating for a while now, says that he is fat and I don't think he is. He is built, but he isn't fat. And he talks about it all the time, and I just don't know what to say to him. He said that when he used to talk with his other girlfriend about it, that she would say, "well, go on a diet," and he said that made him feel like he was fat. And I don't want to hurt his feelings, but I know that by losing weight, he would feel better about himself. But I like him for who he is and how he looks. But what should I say to him when he says things like he is fat, do you think I'm fat, etc.?

2) I am a male, 24 years old, height 5'10", and currently I weigh 143 lbs... When I was 17 or so, I weighed a hefty 190 lbs... at that time, that really had a negative effect on my self image, and now at 143, I still don't think I'm thin enough... I have lost all my weight 100 percent through diet and running about 20 miles/week... but I don't eat enough and I always worry before I leave home if I "look ok"? Do I have serious issues?!?