Quick Question

I just want to pose a question. Where does our past stop and the future begin? Because if we are who we are today because of the past we have lived, where does the past stop? I want to fully give myself over to the possibilities that today and the future hold, but what about past that I still live in? My skin is burned from last week, so I am still wearing last week. I have grey hair caused by years of stuff, so I am constantly reminded of the past. I guess what I am trying to say is that the past doesn't stop just because the sun sets everyday. It seems to always be with me. Hard part about the past is finding a way not to allow myself to be a slave to it, because Christ has broken those chains...So why do I keep trying to put them back on?