Terrible Itchy Legs! i tried nearly everything...

I started shaving my legs ever since I started high school around 13 I think, and recently my legs are so itchy!!!!! I have red spots everywhere!!! it's so unbearable, I scratch it everyday and it goes all red and even worse. I try not to scratch it but I can't help it, I went to the doctors for some creams and it didn't work, so I started using different lotions and different creams I could find to stop this problem but its not getting any better it's red and irritated from shaving, I used different types of shavers too, I tried nearly everything. I don't know what to do now.. is there any ways I can stop this?

Thanks!