When I started out I rode with an excited, yet fearful mindset - excited from just learning how to ride a bike and enjoying the ride, yet fearful of cars and other motorist traffic.

I think now it's closer to a Zen thing. I just roll with it if I get passed too close by a car, a car makes a sudden U-turn right in front me, a car cuts in front of me even though I have the right of way on my protected bike lane, etc. At first, I was getting upset at those things but now I just accept that things like that come with the territory - if I can't accept that, it means I have to give up bike commuting and go back to just public transit and/or driving a car to commute, neither of which I find as rewarding. When I'm riding my bike I'm truly living in the moment, not thinking about stuff at the office, what I should have for dinner, etc. Irritations like bad behavior from motorists, pedestrians, other cyclists, etc. come and go, and once they're gone I tend to forget about them. It helps when there's beautiful views.

I really, honestly, enjoy riding a bike more than sitting in public transit or driving a car. If I didn't, I wouldn't bother with bike commuting or the disadvantages that come with it.