Therapy is the place to take the time to talk about it.  What is holding you back?  What happened in that past that you have put aside to "deal with later"?  Maybe now is the time to open up those carefully constructed boxes that have been sitting on a shelf - issues that are affecting you here and now, when you thought they were put away.

Or maybe it is something that has happened early on that has now shaped your life and how you do things.  Childhood is the foundation of our life and if experiences there were painful, those coping skills your learned as a child might be part of what is making  it difficult to heal and move forward now.