when i was about your age (i am 27 now), i thought of this too. what happen is that i dream of my own dealth and i feel so sad that i need to leave the world i am living in right now. i cried and cried. but after that, i realise it is just my thought. it is not a reality. it is not happening in the present moment. i think the reason i cried is because i have still so much things that i have not done in this world. i wouldn’t want to leave now. i still want to achieve lots of things in my life. but once you realise the thought of dealth is just your own thinking. you can work towards reality. reality is your parent is still alive, you should treasure every moment when you are with them. for yourself, works towards what is your goal in life, a purpose of life. past is just lesson to be learn, future is unknown and is created by our mind of thought and thinking. present is a gift, you are gifted to be alive. i am now double your age, but i still have so much to learn and understand. have some courage to walk your own future, because we don’t know when we will die, we must treasure every moment that we are still alive. hope it helps a tiny little bit, cheers!