Growing up definitely sucks. it feels like you lose some of the happy things you find enjoyable. it feels like fun comes to an end. it feels like you're all alone. so it's definitely common for someone to feel terrified of it, or scared. but, not all of it is bad. i don't really know what reasons you are terrified of growing up for, but ill guess because of losing things,feeling horrible all the time, or the amount of pressure you get the more you grow up. if so, I'll tell you that it sure happens, but it doesn't have to be as bad. when you grow up, you will have to pay taxes, find houses, go to stupid meetings your boss might tell you to go to, and more. but, what makes it okay or good, is that out of all the bad things they have, there are small things that make this hard life enjoyable. painting,hanging out, staying up real late to watch one of the best shows of all time with your dog, going to that new years party your neighbor is hosting, and much,much,more. people like to tell you adult life sucks, and that you'll die once you step foot in it. but, they don't tell you that, it doesn't have to suck that bad, it just depends on your perspective. i haven't been an adult yet, true, but i have done some research on it,( going on to quora and reading questions asking how is adult hood is really like) but i think you'll be just fine.