Am I entitled to anything?

lisyloo

But you seem to have £280 to live on a month, which if that's JUST food should leave you £150 for beer.

So no costs to travel to work or to buy clothes?
Seems to me you've missed out quite a few basics here, but I guess some might prioritise beer over having clothes to wear.

Without wanted to sound obvious, the two main things you can do are increase your income (second job?) or derease your outgoings. We don't know the circumstances but could you lodge with parents/family or lodge with a family or share with more people.
If you want more help the best thing to do is to write down everything you spend (including tax & NI as there seems to be a question mark there). It's only with FULL disclosure that people can really provide helpful suggestions.