I'm going to purposely avoid my friends because I don't have enough money to hang out
Why would you avoid them?
I want to save some money
I'm sorry your finances are so tight.  Might I suggest working a bit more so you have money to hang out with your friends?
I just want to save some money for things I need in the future.
It is good to save money but if you don't spend some money to hang out friends you might lose your friends. Then would earning all the extra money be worth it.