Removal or replacement of chin implant
There are many options to discuss with your surgeon. You may remove the implant and leave it alone, you may reduce the implant that is in there currently to see if this better appeals to your aesthetic desires or you could consider a different style and size of implant to better fit your facial features. I would discuss these options with your surgeon and the pros and cons of each. Your surgeon should open a discussion with you reviewing these options, while addressing your concerns and then set forth a proper surgical plan.
Removal and replacement of a chin implant
One option is to remove and replace the chin implant with a different size, either larger or smaller. Another option is to simply shave down the current implant to meet your expected goals.
Simple removal of the chin implant would be the treatment of choice. Try to find your old preoperative pictures and see if you would again like to look that way. More than likely implant removal will result in your old appearance.
Go ahead and remove the implant. If after 3 months you are not happy, you can have a more appropriate implant placed.