Hello,
1. Irrespective of whether you wear your specs or not, your eye power is bound to change, and keeps changing..and slowly it gets to a constant number, after a few years.
2. So if you don't wear the specs, you will get eye strain.. heavy eyes, tired , headache etc, and the symptoms are more for cylindrical power. So keep the habit of wearing the specs.
3.Dont assume that your eyes are getting "weaker", eye sight issues depend on the size and nature and lenght of your eyeball. So as your hieght increases, eye ball size can change, and number changes.
Next Steps
After 21 years of age, and after your eye power remaiins stabke for more than one year, you can opt for refractive surgery. after a detailed examination.
Health Tips
contact lenses are also an option.