i think you should go to doctor for that itching problem. im 21 and had the same problem since 19
my hairline is good but the top of my head which is the itchy part is now lost all its density. i can see my scalp through the hair now.
looking at your oily skin and acne i can tell you're not showering regularly and probably never go outside either *thus staying in your room damp and hot*
im the same so it finally hit me, i think we might have some sort of fungus or infection i dunno. finally have enough f*****g money to afford going to the doctor so we'Ll see if i have anything like that.
does it kinda hurt in a bitter sweet way when you touch your hair ?