Adopting a growth mindset is a powerful way to motivate yourself at this time.
We don't always make the right choices every time, but it is our choices, and the choices of those around us, that set us on our path. If you spend too much time procrastinating and being afraid to make a decision, you won't move forward with a clear purpose and your progress may slow down. However, if you make a decision that turns out to be wrong, you can't allow yourself to get stuck in a muddy pit of frustration and regret. We all make mistakes as we move through life. How you bounce back from them, your personal resilience, is what will make all the difference to your future.
Don't ignore the signs of stress. Stress is a tangible, measurable thing. It is very real and it can wear you down very quickly.