I've been myopic most of my life.
If you can read OK without your lenses, then it's OK. If you start getting headaches, then you need to wear the lenses.
Myopia is caused by the shape of the eyeball. Wearing glasses will correct the vision problem but will not "cure" myopia. The only way to do that is to modify the natural lens of your eye (e.g. lasik) or, after about age 40, it's not uncommon for the condition to lessen.
If the glasses are too big of a problem, then you might consider contacts. I wore glasses from third grade to about age 39, then I switched to multifocal contacts.