Itchiness Caused By Disease Or Disorder Or Etc?

Wassup doc!

I have problem which I do not know if its a disease or a disorder.I used to be active in sports till I was 12 years old.After that,when I walk for some distance,my feet will start to itch.

If I run,my whole body will start to itch.I will have to stop running as the itchiness will become so unbearable.

Sometimes,if I wear wet slippers,my feet will itch as well.When I scratch,it becomes more intense.

And i'll be scratching till I my skin comes off.I'd try not to scratch and think bout the itchness much,but at time I just had to stop walking and scratch my feet.

My mom told me it might be due to the blood circulation.I have not consulted a doctor about this.

If I sling a bag,the bag will bounce near my hips while I walk.And what else,my hips will start to itch.

The itchiness does not only occur while i'm walking,but also if I carry a bag or sling it.

Scratching is so relieving and at times I do not mind gettin wounds.And I have sensitive skin where it leaves scar.When I scratch at times,and I know I would scrape of my skin if I don't stop,i can't help it as it just feels good.

I am really baffled by this.Please do help me.Im afraid but I really want this sensation to stop as i'm really comfortable.What is this and what am I supposed to do?

:(