A couple of years ago I have noticed a heart-shaped vein. Now more and more have appered all over my body. Sometimes I know a heart is being created out of the veins when my veins start to hurt as a new vein is created to connect to another vein to make it heart shaped. What does this mean?? Is it bad to have them??

Both you and your friend have heart shaped veins?
It means nothing. No heart is being created. Veins squiggle and zig zag.
Next time you have to go to a doctor, ask.