Post graduation trip question

So me and 3 of my friends want to go to Malta this summer after graduating high school. 2 of them will be 18 while me and the last one will be 17 (turning 18 later this year). Will we run in any problems with transportation, accommodation etc since we won’t have parents with us? What should we keep in mind? We are from a country in the EU and we have passports and IDs. Any advice and knowledge will be greatly appreciated!