I accidentally killed a squirrel today and feel terrible. How can I make myself feel better?

I was driving through my neighborhood on my way to work today and two squirrels were out in the middle of the road. I slowed down so they could run out of the way but in the process I accidentally ran over one. I turned back around and got out of my car to check on it. It was dead. I feel totally awful. That squirrel never did any harm to me and I killed it. I know you may say it is no big deal but I am a nature lover and it feels like I have committed an atrocity. What can I do to make myself feel better. Please, no rude comments.