Since I made my decision in 2007, every time I was asked why I want to study Psychology I will reply because it's been my interest since I was 13.
Thankfully everyone left it at that or I would have to create some story to why it's been my interest.
Most fellow students in my university have the same reasoning. To help people help themselves.
For me, it's to help myself understand and cope with my family.
Imagine facing someone with multiple personalities. He (or she) can be the most innocent guy at one point, and the next second he's totally someone else.
Now imagine living with that person. Every day in your 21 years of your life, you have to be quick thinking, knowing which personality you're talking to at that point. If you're not, something unpleasant is bound to happen.
Now take that one person, and multiply that by four. Each "clone" has varying degrees on how serious their condition is, say one has just 2 other persons inside him, another has 5, another has, oh, say 24.
Each of them are staying with you. Not only that, you have to depend on all of them for just about everything. Food, shelter, transport, financial and emotional support. Somehow it works, they can provide all that for you, but you have to live with the constant stress of not only keeping them happy, or at least neutral emotionally to you, but also to each other. Add more stress when they are always unhappy with one other, or will switch personalities when another is around or even total strangers.
Yes, their multiple personalities are well versed in stage art. They are perfect actors to the outside world.
And you strive to be.
Though I don't think I can anymore.