Many big tasks are unmanageable. They paralyze you in their size and scope to the point that you can't even fathom how to begin. When you come across a task like this, it's important to deconstruct the task into smaller, manageable ones that will lead you to the ultimate goal. Practicing this ability daily, will give you a powerful tool for your personal development.
If you find that you feel as if your life is missing something or need some kind of an outlet for stress, consider taking up a hobby. It will fill your time with something productive instead of worrying about the things in your life that you cannot fix. These hobbies can be just about anything that interests you.