Thanks a lot!
I never looked at a game engine so I don't even know what I'm missing, it seems that as long as it's in 2d I manage to do what I want to do with base Java. However the only one time I made some 3d thing, directly using direct 3d library, it was super overwhelming though so if I ever work with 3d again then I will, it might not happen though as it was not related to one of my games and I'm not specially interested in making 3d games.