Invest in yourself
Spending your time and money for your own improvement, future success or good time / enjoyment. As opposed to spending your money and / or time trying to please people especially people you don't like.
" I can't believe it! I just blew her rent money hosting a big dinner party for my frenemies."
"Yeah it sounds like you don't know how to invest in yourself. "
"Yeah it sounds like you don't know how to invest in yourself. "