Well, the fact that you used the term "holiday" instead of vacation suggests to me that perhaps you're European? Your profile doesn't say, but of course the legal age of adulthood is 18 in the States. In most states, anything below that and your parents are your legal guardians and can report you as a runaway, which allows the police to look for you and take you home if they find you.
Some teens become legally "emancipated" from their parents before age 18, by order of a judge, but this is difficult to do, and is a serious step for someone to choose - probably not a good idea to pursue this so you can go on holiday.
If you are in fact European, than of course completely different laws would apply.
girl i would just go
I think that the main concern is if there is a responsible adult going on the trip who is over the age of 18. The majority of states will honor that. I am not an attorney but I have taken quite a few foster children on trips and my children have ahd to have paper drawn up so they could go on trips.
I would have my parents write a paper giving consent for the person to take you on vacation. It has to contain the location to and from the place and the dates. I always would add a day or two extra in case someone breaks down, etc. The paper needs to place an adult in charge of you and have them willing to take medical responsibility. The paper needs to be notarized at a bank or credit union.
It is important that your parents feel comfortable with the arrangements. Remember they have your best interest at heart and your protection. Creating the paper will help in case of an accident or if there is a situation, such as being pulled over for speeding, which may result in the police questioning why you are there.
not evern jocking me and my boyfrien wanna go on holiday to spain next year and were gunna be sixteen so can we not go or how old do you have to be ?