I recently came across this very interesting article written by Mark Manson called "7 Strange Questions That Help You Find Life Purpose".
I highly encourage you to read it. After all, (like the article says) there are many people out there who don't really know what they want to do with their lives.
Some great highlights:
On "Picking what flavour of shit sandwich to eat":
Everything involves sacrifice. Everything includes some sort of cost. Nothing is pleasurable or uplifting all of the time. So the question becomes: what struggle or sacrifice are you willing to tolerate?
On "What makes you forget to eat and poop":
...don’t just look at the activities that keep you up all night, but look at the cognitive principles behind those activities that enthrall you. Because they can easily be applied elsewhere.
On learning how to "better embarrass yourself":
Embrace embarrassment. Feeling foolish is part of the path to achieving something important, something meaningful. The more a major life decision scares you, chances are the more you need to be doing it.
On how you're going to "save the world":
Find a problem you care about and start solving it. Obviously, you’re not going to fix the world’s problems by yourself. But you can contribute and make a difference. And that feeling of making a difference is ultimately what’s most important for your own happiness and fulfillment.
On "how you'll be remembered when you die":
Discovering one’s “purpose” in life essentially boils down to finding those one or two things that are bigger than yourself, and bigger than those around you. And to find them you must get off your couch and act, and take the time to think beyond yourself, to think greater than yourself, and paradoxically, to imagine a world without yourself.
Read Mark Manson's entire post here. Regardless of where you are in life, you'll be glad you did.