Wanting advice on new relationship w involving bdsm

Me (19f) and my partner (21m) have been together for some time now and recently been talking more about bdsm and kink stuff we want to try out. I’m very new to this world of excitement and by new I have no experience. My partner has tho in his past.

The things I want to try out are pretty out there for a “beginner” (ie. cnc). I’m worried he’ll see me like the rest of his partners or subs. I’m not wanting to portray that slutty blonde but I’m afraid thats what hes been with so that is just what he’s into cause he’s used to it. I know if I asked he’d say he’s not into that n only wants me but I think it’s to save my mental. I know all of you are gonna say communication and talking are really the only things to help. I know.

I’m wondering if having this lifestyle comes with these burdens of jealously and anger or worthlessness and wondering if I’m better and can go farther than the last. But feeling pressured as we’re wanting to get married so I’d be the last one. I’m wondering if it’s possible for a male (dom) to truly only see me as his one and only sub with having past subs that were better and did more.