verbal abuse from a teacher
I've been practicing Aikido for 6 years, every day, at the same dojo. It has been my goal to become Sensei's uchideshi, however as the years went by I realized that he is quite difficult to deal with. For 4 years I helped him with kids' classes, dojo maintenance, website building, and even babysat his son. In other words, whatever he asked, I did because I respected him and wanted to learn from him. He'd reward me sometimes, by giving me free uniforms or weapons, or letting me attend a seminar for free. (I should mention that I started when I was 13 and now I am in college, thus the money for Aikido was always tight for me)
However, amidst these rewards, he would frequently yell at me, call me dumb, or an idiot, tell me that I should be ashamed of myself, things like that... Sometimes he scolded me in private, and sometimes in front of everyone. Overall, whenever I made a behavioral mistake and did not live up to his moral standards for me, he would make me feel guilty and worthless. He tells me that it's because he cares for me that he is expecting more out of me than out of any other student in the dojo. He tells me that I have to believe him, and never discuss his ill decisions with other students. Other people in the dojo verify that he is very controlling and often treats me like crap. No one else treats me in the way that he does.
Because I want to be serious in my training, I was wandering if this verbal abuse is of any good. It really got to me during my senior year of high school and if it weren't for my school teacher who saw me change from a confident person into some miserable heap and decided to help me. From her standpoint verbal abuse is not right and she thinks I should find a different dojo because it might end up causing problems in the future. (For example, girls who were abused by their coaches then ended up marrying older, abusive men because that's what they were used to). But, I've read a few things about uchideshi and I know they were mistreated.
My question is, does this kind of verbal and sometimes physical abuse lead to any character building? If I decide to stay with my current Sensei, is there any chance I can become a better individual or will it destroy me? I've read that students often become like their teachers. I don't want to have the same personality as my Sensei, but I do love his technique... On the other hand, I would love to improve my own personality, but I don't know if standing verbal abuse will help me achieve that goal or not.