What's my purpose in life?

Now, I've started to work, my very first permanent job, a full-time job, no longer a freelancer nor a student. 

Besides working my ass off for money, to save up for buying cars & house in the future, what else is the purpose in life? A question that keeps me wondering. 

At this stage of life, I feel like lacking of energy & motivation. It's a shame that someone is lacking of these at such young age. Maybe I need someone to motivate me or I'm just finding excuses. After a long weekdays of work, I feel the need to just lie down and sleep in on weekends. Sometimes I do hang out with friends, but mostly I just spend my time on my bed & internet. I sound just like a useless piece of garbage. I don't wanna spend too much time on hanging out as I think it's a waste of money, as I am poor & I would like to minimize my expenses. Yes, I am a kiamsiap person. 

I guess I need to pick up some hobbies and improve myself, like starting to draw or paint again, read some books (I have a lot that are dusting in my room), I need to do exercise, learn a new language or at least improve my English, I guess I just need to find something that could help me to feel to be more useful and purposeful in life. 

Life is hard, even having a purpose is hard. 

Would I just stay like this for the rest of my life? What could I do to make a change? What should I do to make myself feel alive again?