Flat nipples, 34A. 17 years old. Is there anything I can do to make my nipples stick out? (Photo)

I'm 17 years old, and a 34a. I noticed when I was around 15. I got my nipples pierced thinking the piercing would make them stick out but it stood the same. I'm very self conscious.I am dating a guy and he really wants to see my breast but I'm too shy and nervous. My mom said she would take me to get my nipples done but at the age of 18.I can't wait that long. Is there anything I can do to make my nipples stick out? When they're cold they stick out and then they go back to normal. :( thank you!