Firstly, you're a good daughter and your family are going through a transitional phase. So now, you need to take it upon yourself to write a short note explaining how you are your own person and that you must be able to live your life as they do their own. Reiterate that you love them and include the times you are next able to speak to/visit them, but don't waiver and make sure the boundaries are very clear. It's not healthy for you to be expected to meet all of their demands. You're only young once and when they see how assured and eager you are for new experiences maybe they'll be more willing to deal with empty nest syndrome in a more positive way. Perhaps you can arrange a return visit to share your experiences and show them all the photos of your holiday?

Best of luck.