
Ok.......Im a Swede, but my keyboard is not allowing me to write in Swedish, so grin and bear, English it is going to be

Let's just look at your choice of words: Aldrig! Huaaa, aldrig say aldrig. Already you have stated you cannot. A mind thing is it not?
Lyckats: So, this is about success or failure. Either or: either you succeed or you fail. Just that raises the anxiety level, and should you one time slip up: oh now you are a complete failure. And now you have to shop to feel better.
Tip: drop this terminology. It has psychological effect. Not a positive one either.
I think we need to get to know our brains more, the old Neanderthal brain, when it was about survival.
A piece of paper (money) or a plastic card is not telling our simple brain that this is useful, so that ie purse, or cake, or steak is more useful to our old brain. So, here we need some thought before buying with our modern brain.
Which brings us to impulse control: If you are not rich, or have oodles of money stashed away, in our modern world you cannot afford to just buy to "feel good", there is just too much "feel good stuff" out there to buy. This is a "high" in the brain, but subsides quickly when you put the bought item away and discover your world has not changed that much anyways. And then you are stuck with the bill (hang over), and a feeling of failure.
Here is your project: Go to a shopping centre: Your plan is not to buy a thing, not to buy. Look at all the stuff. Ask yourself what is the worst that is going to happen if you don't buy That Thing (what ever it might be). Then walk out and go for a stroll in a park or go home. How do you feel right now? Anxious? Feel you have self control? Feel happy about still having that money in your pocket and not in somebody else's pocket? Practice this a few times till you feel confident in your impulse control.
Write down what you saved with todays date. AT the end of the month look at what you saved by not buying it right away. Also write down on the other side of the list of things you would have liked to buy and what you would have spent. At the end of the month, look at those numbers too. Ask yourself: Do you feel really unhappy about not having those items in your home? Can you feel any difference? Do you feel good about not having that bill? Do you feel good about having that money in your bank account instead?
Hopefully this would give you a sense of well being, accomplishment and that you CAN do it with a little thought applied to this process. No rocket science really.
No beginner saver starts out with a 10,000 in their account, it is a slow process. It is all the raindrops that makes the river, not one huge swimming pool dump of water, unless you are a uber rich man's kid. Which we are not.
Sometimes it can be fun to compare yourself with others, to gauge how you are doing, but that is pseudo science and should not be taken to seriously because everybody's brain is different and we have different circumstances. Compete with your self: "Can I do better?", What steps should I take?" What do I need to do differently?" etc. These questions will give you a sense of direction and a sense of control.
Impulse control, asking yourself what you really really want, is it a short term fix of bringing home some item that you don't need for a short term feel good, or do you have a long term goal ie. having a wad of money for a rainy day (car break down) and still feel calm and still sleep well?
Before you buy any big ticket item: Research, there is a lot of tips and info on the net, ask for help.
Find a hobby, interest, meaningful activity to fill the shopping gap once you given up on the "shopping hobby".
What do you prefer? What do you want to do? What little steps will you take to get there? After all, it is your hard earned money and how you feel about yourself. A good nights sleep is so sweet.