Is it normal that my left nipple is way bigger than my right nipple?

I am male and since young, I unconsciously always play with my left nipple when I sleep, gradually I play with my nipple all the time when people are not around, I am not very comfortable with having my clothes off around people when there's a party at the beach or things that acquire you to. Until now, I still play with it but I always try to resist the urge, it's become a habit. Also, when I wear shirts, my left nipple is so obviously bigger than my right nipple and I have to use scotch tape to cover it so it won't look weird when people look at me.