My prescription's since increased, but when I was first tested and found out I was short-sighted, I didn't want to wear them all the time and only put them on in class when I had to look at the board. But then it became a pain to keep on taking them on and off so I eventually graduated to wearing them all the time- no one really made a comment about my gradual transition to glasses (although about nine months after I got glasses I did switch to contacts, but I will still wear my glasses to school/out of the house on occasion).
Two of my friends recently had to start wearing glasses and they absolutely refuse to wear them unless absolutely necessary (also short-sighted) but it's really not that bad!