The past has no power over the present moment.
-Eckhart Tolle

If you want to make changes, just be what you want to be. People feel bound to their past.  You only have obstacles to overcome when you focus on not being something else anymore verses being who you want to be.  When you decide to be “a better parent” or “be a healthy person” or “be a supportive partner” who you were even yesterday makes no difference if this is what your intention is today.  Being who you want to be today may take effort and thinking differently, but the thoughts you need to focus on are the ones in line with what you want the outcome to be – you don’t need to spend time on regretting or wishing yesterday (or the last 20 years) were different.  That will only hold you back.  Focusing on today will move you forward!