I used to be this way! I overcame it when I broke down my expenses and earnings and laid it all out to see. The things I wanted to "splurge" on came out to such a small fraction and didn't affect anything that it was more of a headache living without it and thinking about it, than just buying it, this weighted thinking got me to start spending.

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You only have 1 life to live, don't live it so shitty. As long as you're meeting your financial goals and are well aware of the underlying costs of a purchase (like opportunity costs, maintenance, etc.) break down and plan out that balance yourself.