Male Baldness Info

I’m 18 years old and already the hair on the top of my head is getting thin, although I’m not losing hair and no one on either side of my family has history of male pattern baldness. I’ve also had a lot of dandruff no matter which shampoo/conditioner combination I use, it doesn’t seem to go away but sometimes it seems to lessen. My head will also get an itch and when I start to scratch it, my head will start to have a burning/stinging sensation in that area and turn red. I have not been able to find out what is causing this nor how to get rid of it. Would anyone happen to have any insight as to what is happening?