I feel ya, OP. I love my Breton mage. Level 55 now, and loving it. Never had a companion, never will. Never needed one, I was always powerful enough to get by. And companions would just get in the way of my ice storms and die.

I play on normal difficulty. I'm sure if I played on master I'd want to kill myself. But I play games to enjoy them, and I enjoy playing a high-level mage on adept. Just challenging enough to keep things interesting, but with quick thinking I can still overcome any enemy with only magic.