Stop feeling guilty about purchases you can afford. Pre-allocate money to specific accounts before you spend it: a guitar fund, a vacation fund, rent, savings. When every dollar has a job, the regret disappears.
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Every time I spend money on something I want, I feel guilty after, even if I can afford it. How do you get out of that mindset? So what you do is, can afford doesn't mean that you're spending intentionally. So can afford means I have a lump sum of money and I made this purchase. I buy this guitar and it came out of the lump sum of money and I can afford it. But what happens kind of the subconscious level as well, there was other things I could have utilized this money for, maybe preparing and securing for the future, purchasing something for the home, offsetting rent, or whatever it may be. There's other uses of the funds. What we need to do is pre-allocate money to its intended use. I literally have an account called guitar. I fund that and then once the money's in there, I was reserving money with intentionality and there's no what else could that money been used for sensation. Every dollar has to have an intention as it comes in and gets carved up. And once you have that, you have freedom from wondering, well, what else could this money been used for? That's the best way to save. Save with intentionality.