Guy's Behavior

Am I wrong for being scared by my boyfriend's overly enthusiastic nature about having kids?

My boyfriend and I have been together for 2 years. He's overly enthusiastic about having kids with me, and ONLY me, because according to him I'll be the "perfect mother" to his children. I haven't even finished getting my degree and he's here incessantly trying to convince me to say yes to having kids with him in the future. He's gone as far as spending a lot of time reading about pregnancy nd all, and has even made a diet plan for my future pregnancies. I've asked him that why can't he drop the idea, or, want children with somebody else, he's said that I'm the best thing that's ever happened to him, and that's why he's hell bent on trying to change my mind. He said that he'll "treat me like a princess" all the time and has told me that he imagines us with 4-5 children, but is fine with 2 or 3 since he's aware I'm not a breeding machine. But surprise surprise, I feel that he exactly sees me that way. Am I wrong to feel somewhat scared by his behaviour?

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P. S. Forgot to add that once I hypothetically discussed getting chest implants, and he responded by saying that he can't be with someone who doesn't accept herself as she is, and he doesn't want the future mother of his children to be like that.
Am I wrong for being scared by my boyfriend's overly enthusiastic nature about having kids?
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