AM I WRONG FOR FEELING THIS WAY?

My boyfriend and I have been dating for 11 months. We've talked about having kids together and marriage. But he has a son. A 3 year old. He's not sure if the kid is his or not, but he still loves him and wanna take care of him. His suppose to be "baby momma" treat him like poop, and he's never allowed to have his "son". Am I wring for not liking the kid and his mother. And am I wrong for thinking my boyfriend is stupid? I just don't understand why he's not pushing a DNA test. I love him so much but I can't pretend to like a kid that's not his. Plus I'm jealous and I'm selfish. I want to be his baby mama and i want him to myself. I know that doesn't sound right but if the kid is his I'll make excepexceptionsaccept him. If not, I don't want him or his mom in out lives anymore. I hope my boyfriend doesn't cross this question. Please help me and tell me what I should do,