Why do i feel so empty and without purpose? what can i do?

See a doc: Changes in mood and motivation can have many causes. First it's important to make sure there is no physical cause, like thyroid hormone problems. See a doc and get a thorough evaluation. If no physical cause is found, you may be depressed and seeing a psychologist or psychiatrist is the next best step to see what treatment, medicinal and/or non-medicinal may help you get back to normal.