Do you dwell on the past?

Far too often.

I suppose the best thing to do is get engaged in things and look forward to what you can do in the future.

I dwell on the past far more than is healthy. Part of me enjoys it, though, in a perhaps masochistic fashion. I sit and dwell on a particular moment or decision for so long the process becomes intensely meditative and I lose track of the physical world. It's kind of nice.

far too much sometimes, sometimes i can let it go

i have a bigger problem on dwelling/thinking about/ planning my future with things i want to do or study and then never get around to it....

Occasionally I dwell and let things get to me a bit, but otherwise I am better at either holding memories back by focusing on the present or at least trying to focus on positive feelings about a memory.

For example, let's say I think about an old SNES game I liked or something. I'd start thinking about and end up being sad or frustrated that I can't be back in that moment again, or how it reminds me of other good things around that particular memory. I'll start hardcore nostalgia tripping and get pretty depressed about it at my worst.

So instead of feeling down, if I catch myself thinking about something good I'll avoid thinking that I miss those times and instead simply focus on the fact that I was able to have such a good time, and how fortunate I am to even be in the position to have a good memory like that.

In terms of stuff like video games, I'll remind myself that my child/teen me would get pretty pissed off at me if I was getting sad about the good times I had instead of fully realizing that I have a plethora of options of how I can play games today, not to mention all the cool technology that I have readily available now. Just the idea of emulators and Steam alone would make my younger self overjoyed, and I should feel the same about stuff like that today. Be it a superficial thing like video games or more pressing matters.

Most of the time.

Yes. I don't think it's necessarily a bad thing so long as you don't let it consume you, but allow it to shape who you are today and in the future.

No, once I'm over it, I'm over it for good. Getting to that "over it" point can take some time though.

Frequently. I like to think I've learned from past mistakes and they've made me a better person, but certain things wrack me with guilt and bother me immensely.

Best (or worst) example is when my best friend was being abusive towards his girlfriend, my attempts at being the proverbial shoulder to cry on ended up going way too far. We (us guys) are still friends but the whole thing will haunt me until the day I die.