Life in general always has its ups and downs. We always have a new beginning for something or someone means there needs to be an end for something or someone. Maybe we have had an aspect of ourselves or a life experience that has reached its end. The new experience is still new and fresh which needs time to grow and we will need time to acclimatize with it.
The only way to keep yourself from getting lost in anxiety is to always remind yourself: "Don't compare your inner strength with the others" and learn to accept everything.