Budget app

Hi everyone. I started using a budget app in my smartphone because I am tired of always spending more money than I want. Now I am shocked at how much I am supposed to spend to be able to reach the end of the month, well I don't know how I will manage living with this little much. I must adjust myself but I am REALLY worried about that. How can I do that? We'll see. I start tomorrow. Daily allowance is just a little bit... OMG this looks grim I tell you.