You're just starting to learn C++, you can't expect to be able to learn how a game library works over that just yet.
As boxmein said, Java is a great choice to learn about Object Oriented Programming and also alot of general concepts that you will find in many popular languages. You will also have alot less problems debugging Java code then C++ code since the latter one is at a much lower level.
By the way, lower leveled means closer to the machine, not easier.