I realized I spent a hundred dollars the next day
Why would you say that? Did you treat yourself to something with the hundred dollars?
Yes, I went to a casino and spent all
It appears that the amount of money you spent was unexpected to you. You should be careful with your money by setting a budget and only carrying a certain amount of cash on you when you go to the casino.
Oh it's fine. I have my tax return to make up for it.
It sounds like you had a plan when you spent so that is the best thing. I am glad to hear you have awareness.