... when i was being a big sister and overthinking everything ...

so like my younger brother is always asking me for favors and stuff because he looks up to me or something. i know it's kind of sweet but today i told him no i dont have time to help with his homework cuz im busy, even though i couldve easily helped if i wanted to. i feel bad now but at the same time i want my space sometimes you know? im not sure how much hes noticed or if he feels hurt by it, and its making me worry a lot. do other siblings ever have this kind of problem where they feel guilty giving each other some room? is that normal or am i just being selfish?