OP, whilst I agree if you're balding badly you should just shave it, I implore you to visit a doctor if your hair has become finer.
My hair did this last year and receded rapidly. I went to the doctors as it didn't fit my family's hair history whatsoever. Found out I had a major protein deficiency as I had been running about 10k a week and not eating enough protein to replenish my systems. Since changing my diet, my hair has slowly started to improve.