Managing money is really hard especially to people like me that wants to buy anything that I want. When i had my first bitcoin i bought a phone. I changed it first to real money and bought it. And i think why didnt I invested it. Then i had an everyday facepalm everytime I remember that
It's not just you that feel difficult to manage money, almost everyone was also experiencing it. The best way is to change our mind, and starting from now should immediately reduce or eliminate non-essential purchases and divert to long term investing like buying bitcoin or altcoin.
I think it is all about habits. If you break your bad habits of spending whenever you want and just buying randomly, I think that is a good start in properly managing your money. I used to be like that also, but I have been forcing myself to save by auto deducting a portion of my salary, which goes straight to an investment. I have been doing it for over two years now and I aim to increase my savings as my salary increases.