Feel guilty when receiving engagement ring from my fiancée

I recently got engaged, and while the proposal was magical, I find myself struggling with unexpected emotions about the engagement ring. Before the proposal, I only did some casual ring browsing with my fiancée so he knows the style I like. I have told him that I actually don't care about rings that much and fine with a cheaper alternative or even not having one at all. But since my fiancée thinks it's still needed, I suggested some cheaper brands for him to look at. Then he handled selecting and purchasing the ring independently.
Then the proposal happened recently. It turned out that he got the ring from a famous (and also expensive) jewelry brand for around 1.8ct. He said this is for the rest of our life so it is worth it. He didn't want to tell me the exact price but I know the range from doing some research. As a result, after the initial excitement, I became very guilty and anxious when I saw the ring. I also feel very nervous when I wear it, cuz it feels like I am wearing a car on my finger(lol).
Don't get me wrong - it's a stunning ring and I love it. But coming from a culture where people actually feel embarrassed when getting something expensive and love to show off when we buy something good at a cheap price, I cannot really enjoy the ring without thinking about the price. The worst thing is I am scared to talk about my feelings to other people because I don't want them to feel like I am showing off.
Wondering if anyone has been through a similar phase and how you handle this feeling.