Like said earlier in the thread, you'll have to deal with buttloads of resposibility.
Seen as you (Bya) live in the Benelux you'll have right to a scholarship for people living on their own.
however, that will mostly be spent on electricity/gas/water bills, rent, school, etc.
Also, you might want to employ the services of a nearby foodbank if you only have like a 100 bucks to spend on food a month (you will need to save up some money in case your washing machine or fridge breaks).

So yeah, you will have less money for the fun stuff. My advice would be to take a job on the side in the evenings or weekends... which is easier said than done in the current state of the economy.