Originally Posted by orrzxz
so recently i saw that i dont have enough space for applications... although i have 11.5 GB USB space cleared.
im running Android 4.1.2 and im rooted.
the device is Galaxy S2 i9100
P.S. i dont have a SD card.
USB storage is for your personal files such as photos, videos, music, etc.
Meanwhile the 2 GB system storage is for your apps, including data and cache.
You could "move to SD card" in Settings > Applications to free up some space, but that will make your apps slightly slower (to load).
I don't know about repartitioning but that could be a possibility too.