> They spend $200 a month on cable and Pay-Per-View while I watch Youtube and Netflix. They pay $65 for videogames and spend thousands of dollars a year on vacations.

What do these things have to do with being an introvert?

My strategy is, instead of budgeting or being as austere as I can, I set a mental threshold for how much fun or peace of mind or happiness a dollar is worth to me. If something is above that threshold, I spend money on it. If it's below that threshold, I don't. If I'm spending too much money, then instead of making a budget, I raise my mental threshold.

I'll spend money to have my lunch delivered because the saved time and mental energy is worth it to me personally. I will not spend money on a car that does anything more than get me around and run AC, because I'm not someone who gets great enjoyment from the car I drive. I am into gadgets and will spend money on the latest tech - even if I don't strictly need it - because I get proportional enjoyment out of it. I won't shop recreationally on Amazon for things I only kind-of want, even if they're very cheap or on sale. Etc.