Default rom installation question

hello i just installed optimus g3 1.3 and before installing i in twrp factory reset, wiped cache,d cache, system,data,. was i supposed to format as well?

the resaon i am asking is because all my old data is still on my the device but i cant access it. even the apps. if i open a file manager in the device section its just the new rom files but then theres a partition or sub section called sdcard and thats where all my only stuff is. how do i correct this? also if was am supposed to format wont that delete the roms zip file i have on my internal storage?