Can I spend my money on something for me?
Why do you want to spend your money on something for you?
I want to find ways to be more relaxed with life.
Having a relaxed life is what we all crave, but it is not always that feasible. Make sure you have those bills paid for until at least the next month ahead if possible. Save more money than you spend, because you will regret the poor spending habits later.
I just want to buy a game that I'm interested in.
It is completely fine to buy a game every once in a while for yourself if that's what you want to do. While you should make sure that your bills are paid first, there's nothing wrong with using the extra income on whatever you want.