How about I just cut out everyone from a part of my past?

It's hard but sometimes we must, it took me about 30 years to cut my sister and brother from my life. As you can see it took years. 

March 7, 2015 after our mom's funeral. 

My 18yr daughter did it in a day. (18yrs ago) That's right,  she told her aunt to never talk to her again (very choice words)  and if she did someone was going to jail and the other person would need an ambulance. Yep.

Depending on how you look at it, it's easier said than done ! But there are ways !

You can do that, but don't expect it to solve all your problems. You still have to deal with the emotional and mental fall out from that time. Surround yourself with people who want what is best for you and work on yourself as well.

That would depend on your situation. It IS a great idea to remove bad and toxic influences on ones life .. That goes without saying

That would be nice. We can't go back to the past just like we can't predict our future.