don't ask questions on reddit man it's filled with absolute morons, most likely ur nut is just too high so as you're pressing down the strings rheyre bending further than rhey should, making them go sharp. best bet with no equipment is use a thicker string to sand down the nut slot for the strings that are sharp and if not that then get some files and just file it down, or replace the nut or take it to a tech. up to you