alone but not lonely

why is it that some people when a long-awaited vacation starts do something like, "i'm freeeeee! now let's DO stuff!!" i feel more like, "i'm FREEEE. now leave me alone for about 3 days, and then i'll see if i actually want to do anything after that." i know myself, and i don't feel guilty about actually having that feeling. i work with people all the time, which i love, but i am also the kind of person that needs time by myself. but i am also the kind of person that gets depressed if i spend too much time by myself. but time by myself is not bad, it's good. it's a strange tension. but what this means is that when vacation starts, it means i actually have the freedom to spend an entire day alone and do whatever i want if i feel like it, with NO WORK that i have to do. that is very amazing, for a teacher, to have a whole day and also know that there is no work that has to be done. so when a vacation comes, that is what i want to do. nothing that involves making plans with someone or going somewhere. only special people that have an understanding that we can be together and not have to be DOING something to together (but perhaps we might decide to eventually) are the people i want to "do" something with when i feel like this.

so the guilt comes though, when the other type of person who is free on vacation and wants to DO things asks me to do something or go somewhere and i really don't want to do something or especially go somewhere and i know that i need several days of not doing anything resembling that before i will want to do something like that. so i say no to people who with good intentions want to spend time with me and enjoy each other's company. does this make me terrible person or at least someone that drags other people down or puts out their enthusiasm...? i hope not. but i still have this feeling like, "it's vacation and you have time to do things with people, so why are you saying no?" i want to BE with people, but i don't necessarily want to DO things with people (a lot of the time i feel this way, but especially during the first few days of a vacation--many other times arise where i do actually want to go out and do things with people too--but i can often be content to just be with people and not be doing something together). i know other people exist that feel this way too, but it also makes me feel weird and guilty that i feel this way.