it is not normal for any car to pull.

Check your tire pressure and get the alignment checked

It's not normal on a flat road, but most roads are crowned for water
runoff. So if you're on the right side it can cause a slight drift to
the right. Also uneven air pressure and the tires themselves can cause a
drift.

I have the alignment checked, things get just a little better. I think Jim
is right. Most roads are crowned, this is why the cars always tend to pull a
little bit to right instead of left. If your car more likely pulling to
left, that must be something wrong with either alignment or suspension.