This is a VERY loaded question but personally, I would say the feelings of guilt and regret. For me, the mistakes I made in the past linger in the forefront of my mind. Just like when you stumble on a flight of stairs, you wouldn’t go back down and start over or just sit down and think about it. You would get up and keep going. I should’ve let go of my guilt and regrets because they hold me back in many ways.