I can never understand how kids can just ask their parents for something?

Like I honestly feel so guilty when I ask for something from my parents like I really do try my hardest not to ask for anything whatever it be christmas or my birthday I usually just say I don't want anything but some times i actually need something like gum or a toothbrush but I always feel like it's a burden and I'm wasting their money on me like fr how do you guys do it?