l just changed them a few days ago and my left contact is starting to hurt my eye already! They're monthly bosch & lomb contacts. It is so frustrating because l just changed them, and now it is already hurting my left eye. But my right eye is fine! Then l thought it was my left contacts that was messed up so l used the right contacts as my left instead, but they hurt too!

Please do not say to change into glasses, because l do not wear glasses to school. I've been wearing contacts for about a year now.
i have soft contacts.

l have contacts that l have to throw out every 2 weeks
maybe its just the kind you have
i use the soft lenses, maybe your left eye is sensitive to hard ones?

Wrong Size

Could be that you have something on the lens that is irritating your eye. This could be a change in solutions or a speck of dirt that has not been cleaned off.

Go a day or two without them and see whether that fixes the problem.

l would also suggest you visit your optician to ensure there is not a more serious infection.