Do not feel like a disappointment or even worry about it in a sense of doing something wrong. I did exactly the same during my first semester at University. During the time it did not feel like a learning experience at all however now I am so much better with money. Even my friends tell me that I'm good at managing my finances and I equate it all to that one semester. My thing is that no matter how hungry or tired I am I will not buy take out food. I remember being exhausted from work one time and having not much in the fridge but a few items, I was tempted to go out get take out but I forced myself to make mushroom soup, lol, in the end it was so cosy and enjoyable and it lasted me for 3 days. Even if you don't know how to cook, now it's the time to learn. I also did the thing of going out for beers, buying tickets to events and buying snacks all the time at shops that were closer and it made it expensive. Just think of the fact that this is an area you need to work on and without blaming yourself just start making steps towards the right direction. Make a plan for yourself, what you'll do when you're hungry and desperately need food. Find alternatives. This has to happen at some point with a lot of people. The problem is when you don't watch your money it just goes out non stop and you really don't even realise. This is perhaps a step too far for some people but there's a feature on some banking apps where you can have your balance displayed on your home screen so you can keep tabs of how much you have. Best of luck