There are two fundamental mistakes people make with their money:
1. They overweight current happiness and underweight future happiness; and
2. They mistake what will make them happy/satisfied long-term.
On the first issue, people tend to choose passing entertainment today over long-term future stability and freedom. They tend to be overly optimistic (e.g., "no problem, I love my job, and so maybe I'll just work to 70," without realizing that in another 25 years, that job might no longer be awesome or they might get downsized). Or they think they will be very different in 25 years ("well, I need this huge house now to raise my family, but when it's just me, 400' will be fine"; they don't consider that they are currently establishing a baseline for space and amenities and they might not want to downsize/cut back).
The problem is that there is no "right" split between Current You and Future You -- it depends on a bunch of things like how much your current hobbies cost, how much you make, how much you hate your job, how stable/unstable your field/employer is, etc. So my approach is to try to be fairly pessimistic about my assumptions for the future. That includes assuming that I am still going to be, meaning that if I like certain spendy things now, I am likely to still like variants of certain spendy things in the future. E.g., maybe you won't be able to play your sport any more, but I bet you'll still want to travel to watch it, maybe coach, etc. So make sure you are starting from a savings rate that is going to give Future You the same opportunities you would want to have now, and that doesn't lock you into working longer than you may be able to (or be able to tolerate).
On the second issue, this is the classic "stuff vs. experiences" thing. There's nothing wrong with a nice purse; the problem is that most people think the purse itelf brings joy, when in reality the joy comes from I Have A New Thing and fades rapidly with the newness. So they have to keep repeating the cycle with more stuff to continue to be happy. OTOH, if the stuff you buy is actually the stuff that brings you joy, then it's worth it. E.g., I have a convertible. There was a huge surge of joy when I bought it, of course. But 4 years later, every day I drive to work with the top down I *still* walk into the office with a big-ass smile on my face. So to me, that was a good purchase.
It sounds to me like you actually have the second issue pretty dialed in -- you know exactly what makes you happy and and are directing your dollars to that, to the point that you are even willing to take on a second job to allow you to do more of it. It's not face-punch-worthy to spend money on stuff that actually *does* make you happy on a daily basis! IMO, you already have half the battle won and are way ahead of many, many people who are still throwing money at the wrong thing.
So for you, I'd say go back to the first issue, and take another, hard look at Future You. My sense is that you are so wrapped up in your current passion that you are perhaps undercounting what Future You might need/want, so you might need to figure out ways to move the line a little more towards savings and a little further away from current spend (or find a way to increase your earnings to cover both). But where that line goes is 100% for you to decide. When you are spending money on the right things, it's only face-punch-worthy if you mortgage your future needs chasing current wants.