Some advice?

So I’ve been into bdsm for a looong time, probably since I was a preteen. Now I’m still pretty young(17) but I’ve been in a relationship for more than a year with a guy I’m really comfortable with, which is surprising to be since I can get extremely insecure. I haven’t had vaginal sex but we’ve preformed oral on each other and he’s touched me and it can get very sexual at times. I’m a sub, like extremely, I love being degraded and pain and being controlled and my boyfriend satisfies all my needs and seems to be very dominant which I love. However he hasn’t come to terms with saying he’s into bdsm although he fits the persona of a dom perfectly with the way he acts and treats me, both

normally and sexually. I want to explore this more with him and dive into the bdsm world but I’m not sure on how do advance this to something more like bondage. What’s the best way to approach this with him?

Like I’m in the need for a fifty shades of gray moment!