Am I (23F) being too sensitive, it is my boyfriend’s (23M) fake displays of “manliness†making me look bad?

Hey Dating.mobi! I need your opinion on my situation with my boyfriend, who I will call Dean. We are both 23 and have been dating for five years. Lately we have been talking about getting engaged within the next year or so. Please keep in mind that he brought this up. We talked about it and decided that we’re both ready and he hinted at proposing to me within the next year. I know we are both young, but plan on having an extended engagement to save up money and prepare for this big step. Dean seemed just as excited as I am, he sometimes brings it up in conversation randomly. Like we will just be hanging out in the living room and he will turn to me and say something sweet like “I would marry you right now if I could.â€
Anyway, this weekend we attended his older sister’s wedding. It was a lovely ceremony, and I got to meet a lot of his extended family that I haven’t met yet (he has a huge family and some live far away) They all seemed very kind. At one point, a few of Dean’s uncles and male cousins were talking with us. They started joking around and saying things like “looks like you two are next†etc. Dean sort of recoiled away from them and said things like “not anytime soon†“no thanks†and “don’t give her any ideas†etc. I was kind of disappointed and taken aback because I thought we were on the same page with the whole marriage thing and he was the one who brought it up.
Later on in the ceremony Dean saw the centerpieces and said something like “would you want this color for the wedding†and I said “I thought you didn’t want to rush into it anymore?†He was confused so I reminded him about what he said to his male family members. He said “I didn’t mean that, I was just saying it because that’s what men say. It’s a masculine thing. We are supposed to not want a wedding.â€
Dating.mobi, I don’t know if that’s a thing that men do. I figured if you want something, you just say so and don’t act like it’s the plague or something. I feel like, by saying those things he made me seem like a nag to his family that hardly knows me, and like if we got married I would be sort of forcing him into it. Maybe I’m just being sensitive, but my sister’s husbands were both excited to marry them and let people know that. Neither one of us are from any hyper masculinity cultures... I just wish he would be excited to be with me around others like he is when we’re alone. Do I need to grow up and get over it, or he being a bit dickish? Be honest with me.
Tl;dr: my boyfriend recently brought up wanting to propose to me soon, I was on board. At his big sister’s wedding, his male family members mentioned us getting married and he acted horrified. Later told me he was being fake macho. Am I being overly sensitive?


Source.