You have to be more specific, "solo roaming" is what you enjoy.
The thing is, the classes were not designed with this in mind, some classes just happen to be stronger at it, not by design.
Their available skill set helps them, while others are quite bad at it. You can adapt to a certain degree with gear and spec but the odds will still be in favor of a few classes.
It is very unlikely that classes can be brought on equal footing for 1vs1 and no matter what you do, some classes will be ahead.
You just don't like to be occasionally on the other end.

It's no duelling game after all and chances to have a proper 1vs1 without better potions influencing the outcome or outsiders adding to the fight are quite small.