Cant write advanced projects

Question

Hello everyonei have a problem and need some advices.The problem is that i can freely write programms like Student Managment System,SuperMarket Application,HotelManagment System(if i'll try i can write game like Super Mario),But i don't know how to write applications like Antivirus or teamviewer and applications like that,wheni am starting thinking about how i can start to write teamviewer, i think that it is impossible for me idont know....... please give me sugesstions....have you ever been in a condition like i am right now?tell what u did and things like that...thank you.