I think you would be in good company. I have met a few people who struck as psych. majors. I remember a guy who seemed to need a therapist and was studying psychology. My strong interest in the field is parially because of my interest in self-improvement.
I would caution you though that nearly everyone in my class seemed to say at one point or another that this disorder or that disorder describes them. It will probably be something that you will want to look out for. I had a case study that had avoidant personality disorder and depression. I was like this person is too much like me for me to diagnose this person. I did recognize the depression right away but avoidant personality disorder and social phobia is too similar to each other for me. I will warn you that the classes can be hard because you sometimes get a classmate who just doesn't get it. One classmate of mine said something about somone being "whacked" and other jokes about person's hair in a video. My teachers tended to try to steer this student from his remarks but it does come up some with some classmates. This classmate had been in treatment for an AODA issue which is why it surprised me. The material also relates more directly to you than it will to other students. Sometimes this gives you an advantage because you can understand what if feels like to have a mental health problem and see a counselor but at other times it can back fire. I hope you can make your interest in the mental field work for you in some way. Who knows maybe we will be colleagues some day.