Relationship Advise Please...

My boyfriend and I are 19 and we've been dating for over a year. But his mom is still weird with me. My boyfriend has only came over my house maybe three times we've been dating because his mom doesn't want him driving 20 minutes to my house. But she's ok with me going there four days a week and spending all my gas. I'm ok with it because that's the only way I'll get to see him. I thought his mom was super over protective because she didn't know me well at the beginning of me and my boyfriends relationship. But she's still weird. She's told me that she knows (Hunter) my boyfriend isn't the type of guy to screw around with other woman or go party or smoke or drink but yet her actions show otherwise. She always has to be near in the same room with us and my boyfriend and I can't even go in the front yard to talk by ourselves without her being there. She got mad at me last night because I wanted to talk to my boyfriend alone in the front yard and she started yelling at me to come inside. I started crying because I'm not the type to get I trouble a lot. And it just feels like she has to be all in our business. I get it that's her child but he's 19 and so am I. Also my boyfriend doesn't see anything wrong with it but me and my mom see there is something wrong with his mom. I have never ever hurt her son or put him in danger. I haven't done anything for her to. Not trust me. I feel like I'm dating him and his mom.