I used to be. But now I rarely look back.
You can't go back nor can you change anything that's in the past.

Yes. I used to have a ton of friends and go out all the time with them. Now I have no one.

I am one of the people who move on easily. That's because I never attach myself emotionally to people, which means less hurt. It's a blessing.

A little. I tend to dwell on little things I wish I could change.