Boyfriend wont let me get piercing...

So im 17 about to turn 18 my bf of 2 years is 21 now. When i tell him i was chest dermal piercings or tattoos he says he wont likenit and doesnt want to let me. I say its not fair and that he can't really say so bc nobody stopped him from getting his tattoos or piercings when he was 18. I shouldnt be letting him tell me what i want to do with my body right? He not that mean about it but if i did it he would be upset but have to deal woth it. How can i explain to him that he cant tell me what tondo with my body. We arent even married yet