C# vs Java (Not War)

hello i wanna enter in subject directly i am start code for a one or tow year in school we learn VB.NET then i like the code after that after stay a while in VB.NET i change to c# and stay for long time now i am in holiday and start learning java but after i finishing basics and oop and swing ,JDBC i asked my self why you learn java and lost time focus in one something to improve your self , now i am very confusion

what i need to do

complete with C# or Java or change to another one

if you want to ask me what do you want to create i say nothing specific

i love coding you see me learn at most time new things in what i interested in desktop , web , Mobile Dev(Xamarin),and another thing

ok i talk so much maybe you can say something help me to draw my way what i need to learn and what to do,,

thx for your time :)