Both my nipples are numb. I literally cannot feel them when I touch them, is that normal?

Temporary numbness of the nipples can occur after breast augmentation surgery.  If this is a temporary phenomena sensation should return by 6 weeks.  If you have unusual sensations such as sharp pains or other abnormal feeling occurring spontaneously it can be a good sign that sensation will return.  The risk of permanent numbness of the nipple after breast augmentation is about 5%.  It would be unusual to  lose sensation on both sides permanently.  Of course discuss this with your plastic surgeon.