A vibrant Future is very important for present we live. Sometimes the low feeing is also due to chemical changes in our brain. Like low serotonin will keep mood low in general. So the factors can also be due to chemical changes. But this can be little bit changed with different exercise. I have referred you a book below by Otto which is a nice was. Also see a psychologist or a life coach who can help you sort all your goals and helps you make a action plan.
Next Steps
See a psychologist online/ offline. Sort goals and take small actions towards small victories.
Health Tips
You can read and practise this book. (This is just additional reference and not a replacement for psychological/ psychiatric help) Exercise for Mood and Anxiety: Proven Strategies for Overcoming Depression and Enhancing Well-Being- by Michael Otto