Thanksgiving day

So I called my parents to find out for sure that we were getting together with family and they told me they're going out of town tomorrow and coming back Friday.  They invited me to go with them but I said I'd rather just stay in town.  I really wanted to spend sometime with them but not that much time.  I'm still kind of unsure of supportive they are of me.  I feel kind of bad for saying no.  But I need to look after myself and while I know they would pay for everything and not mention it; I don't feel like taking advantage of them like that.  I don't know.