The fact that you are breaking out means that the glycolic is working. It is bringing junk out of your pores. Just try to keep in mind....those pimples were going to surface eventually anyway....at least you are getting most of it out right away and hopefully, it will not return.
I use glycolic too and it was one of the best things for my skin. Your skin tone will improve and your acne, if used consistently, should get better. That depends, of course, how severe it is....but if you just get the occasional breakout, it should help.
Stick with it!