Do I really need to wear my glasses even when I'm doing simple tasks in my house? Why or why not?
No, in general you can wear your glasses in those situations where you really need to see better than you do without them. Not wearing glasses will not cause any damage to your eyes nor will this worsen (or improve) your uncorrected vision. While there may be other reasons for wearing glasses (such as for eye protection in certain jobs), visually there is no reason to have to wear glasses (in adults).