Answer:
You do not want me when you donβt have me but when you have me you don't want to lose me.
Long and thin red within with a nail at the end.
To you, rude would I never be, though I flag my tongue for all to see. What am I?
I am essential to life on earth! I am split into thirds. Two thirds are the same. One of the thirds is 8. The other two are 1 each.
In buckles or lace, I help set the pace. The farther you go, the thinner I grow. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.