Do I need gles? Fuzzy....?

Whenever I go to the optometrist (1-2 times a year) They say I have perfect vision and that I don't need gles... But I tried on my friend's gles and it seemed like my whole world just turned upside down... O_O Everything was so clear and I just realized that everything is really fuzzy and blurry... I have never realized it until now, but whenever I go to the optometrist I have perfect vision! So I don't understand... I also get dizzy and watery eyes and squinty eyes and I never knew why before, but now I think it might be because of this. What do you think! What should I do? Thanks!