Boyfriend and kids

So my boyfriend has a 5 year old from a previous relationship. And me and him always talk about our future like marriage and he always says he's not sure he wants another kid cause he's biased about his now. And I know I shouldn't let that upset me but I feel like I'm not good enough for him to want kids with me. I want someone who wants a future and family with me. I want my own kid not just playing house sometimes   Am I wrong that it upsets me?