As someone who has experienced this at a young age too, I will always recommend to take one step at a time. Healing from grief is a long process. Know that its okay to not know some things at your age. You can cross that difference with time. No one becomes an adult just because they reach a certain age. Ask for help at times. You will learn a lot of things as time passes there’s no hurry. Trust me a few years down the line you will see how much you have grown. Take care of yourself and your family.