I wanted to be an environment artist when I got into a 3d modeling school, and after graduating, I didn't get to do that for the longest time. I was mostly stuck doing general prop and vehicle modeling. But after years of that, I did get hired as an environment artist, and it's been lots of fun. I don't think I'll be changing my area of focus anytime soon.
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After many years we discover we gravitate towards certain areas and distance ourselves from others.
I actually found that when I entered school, I knew exactly what I wanted to do, and the areas of focus to avoid, which at the time was character model, rigging, animation, etc. But, as I work on more teams, I find it very interesting to see how the other disciplines work and the fun things they are able to create, and sometimes I find myself wondering if eventually I might try to make my own character, build my own rig, or do a complex animation, etc. I do find my discipline very satisfying, but instead of pushing the others away, I find I am developing interests in things I would have otherwise ignored.