Boyfriend's Mom.

Jourdyn
So my boyfriend and I have been dating for three months. I've know hos family for 16 years (I'm 19 and he's nearly 22). I REALLY like him, but I can't STAND his mom. She's constantly putting her nose in our relationship. She always talks about me marrying her son and having kids with him someday. However, she tells everyone that it's me talking about it nonstop. And another thing - I am NOT a morning person.. When I first wake up, I don't engage in conversations for at least an hour,  but she always assumes I'm pissed off. "What pissed you off already this morning?!" I can't take it, but I really like him.. Advice??