(minor spoilers inside)
Garrin,
I'm no sure exactly what you me that your main character is "an enemy" - but I'll take a wild guess that you mean that townspeople are going hostile on him. If that's the case, then its likely that your reputation has fallen to a very low level. When that happens, townspeople and other will have a very low opinion of you and you won't be well received. Also, the town guards may attack on you sight.
If you have an earlier save game, check your rep and if its low, try reloading and make some substantial donations to the churches scattered about town. That will boost your rep up and avoid the problems.
Another possibility is that you have been casting magic in town and have been attacked by the cowled wizards. You can buy a "license" to cast magic at the government building.
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“Every tavern’s an opportunity, I say.”
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