Opinions?

Okay so to cut a long story short me and my two friends were planning on going away for a weekend this year to celebrate our 21sts but I just got my term dates for nursing school and I have five weeks off but now they're talking about going on their own because they can't get any of those five weeks off? Like am I in the wrong for feeling put out? Neither of them are studying. I just feel like saying f&#k it and just cutting everyone off, these are the only two friends I'm supposed to have but tbh I'm over it. I've just told them whatever, just go if you want to go it's fine but haven't heard back yet. Am I just being really sensitive or??